Papers by Friedrich Herms
Editora Científica Digital eBooks, 2023
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International Journal of Geosciences, 2015
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Revista Mineira de Recursos Hídricos, 2024
Brazil is rich in freshwater, accounting for about 12% of the planet's water, althou... more Brazil is rich in freshwater, accounting for about 12% of the planet's water, although many Brazilian cities constantly face problems related to the quantity and adequate quality of this resource. The issue is more evident in large urban centers, which hasled to the need for a process of managing Brazilian water resources. This work presents the history of water quality in the main channel of the Pomba River basin in the state of Minas Gerais after the application of the macrolocation methodology at monitoring stations, using the WQI -CCME (water quality index -WQI) as an investigation instrument, as well as data from Minas Gerais Water Management Institute (IGAM) considering the timespan from 1998 to 2019. In the WQI-CCME calculation model, the analysis considers the entire river and reference year instead of specific stream gauging stations and dates. Therefore, monitoring data from all selected parameters and stations for each measurement year are aggregated. The format of data aggregated by monitoring year behaved like a model of easy maneuverability by allowing the calculation of the WQI by joining all the data from the same year. A smaller number of stations based on the adopted macrolocation model allows a good evaluation of water quality in terms of WQI. Overall, the water quality in the basin remained stable in the time series, oscillating between poor and very poor, and the proposed investigation model did not show a significant trend of worsening or improvement of water quality over the studied period from the WQI point of view.
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Anais do(a) Simpósio da Bacia Hidrográfica do Rio São Francisco, 2022
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Engenharia de materiais e meio ambiente: reciclagem, sustentabilidade, novos processos e desafios 2
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Marine Environmental Research
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Oecologia Australis, 2012
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Marine Chemistry, 1990
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Journal of the Brazilian Chemical Society, 2004
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Environmental Monitoring and Assessment, 2009
This work discusses the temporal variation of metal concentrations in a hypertrophic coastal lago... more This work discusses the temporal variation of metal concentrations in a hypertrophic coastal lagoon located in the metropolitan area of Rio de Janeiro (Brazil). The lagoon watershed includes one of the mostly densely urbanized areas of the city but without industrial activities. Six sediment cores were collected in the lagoon between May and July 2003 and analyzed for the concentration of metals (Fe, Al, Mn, Zn, Pb, Cu, Cr, and Ni). Typical sedimentation rate was calculated as being 0.75 cm year( - 1) and was uniform for at least the past 70 years. Therefore, the alterations in the dynamics of the lagoon caused by changes in its watershed were clearly indicated in sediment cores. The construction of an artificial canal to the sea and the increasing urbanization and soil use changes were the major factors affecting metal accumulation in the lagoon sediments. Metals typical of anthropogenic urban sources (Pb, Zn, and Cu) showed increasing loads following urbanization.
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Revista de Direito da Cidade
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Revista de Direito da Cidade, Jan 31, 2017
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The Guandu River has extents for about 80 km, collaborating with 4% of the fresh
water in Sepetib... more The Guandu River has extents for about 80 km, collaborating with 4% of the fresh
water in Sepetiba Bay. Have an historic of many industries with heavy metals discharges in
expressive quantities; this is the most important source of heavy metals trough Sepetiba Bay.
The major importance of the Guandu river in the region concern in your draining basin areas of eight
cities, being responsible for carrier to the bay a sedimentary charge of about 75% of total, response
also about 70% of treated waters and 25% of electric energy used in the Rio de Janeiro state.
This work trough chemicals and mineralogy analysis in eight stations in the Guandu River,
have the main objective understand with major clarity, the anthropogenic influence of Ni, Fe,
Zn, Al, Pb, Cu e Cd trough the river, identifying the input points and with understanding the
Guandu River as a carrier of metals.
Trough data analyses and correlation between parameters we searched the comportment
and concentrations of metals. Correlation of metals with Al and Fe were not possible. Highest
values are found for Al in Rio-Santos route till estuarine zone, Pb in Rio-Santos route and
railroad, crossing Guandu in county of Seropédica and Japeri, Zn in Rio-Santos, Dutra and limit
and Seropédica and Japeri, and Cu in Dutra route in the bridge between Seropédica and Japeri.
Ni present in highest concentration in Dutra route, this values showing have associations with
industrials activities. The station in Dutra route shows the highest values for many of metals
and should be compared with the polluted river Reno in Germany.
The highest variation of values found trough river sediments take conclusion that anthropogenic
pollution is the principal characteristic the environment in study.
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This work discusses the variation of heavy metals concentrations in the sediments of a hypertroph... more This work discusses the variation of heavy metals concentrations in the sediments of a hypertrophic coastal
lagoon located in the south zone of Rio de Janeiro City. The Rodrigo de Freitas Lagoon watershed includes a
highly urbanized area without industrial activities. The only connection with the sea is a channel constantly
dredged due to siltation. Six sediment cores were collected in the lagoon between May and July of 2003. The
concentration of the heavy metals (Fe, Al, Mn, Hg, Zn, Pb, Cu, Cd, Cr e Ni) in the sediment was analysed.
With the objective of better understanding the behaviour of the metals along the sedimentary column, other complementary parameters were analysed, such as: organic matter and fine fraction contents, concentration
of carbon, nitrogen, phosphorous and sulphur in the sediment; and determination of the sedimentation rate
through the 210Pb method. The sedimentation rate of a sediment core from the lagoon central area was estimated
as 0.75 cm year-1, indicating that a 60 cm layer was deposited since approximately 1923. The alterations in the
environmental quality of the Lagoon caused by anthropogenic activities were clearly evidenced. The results
showed significant changes in the perceptuals of fine fraction and organic matter contents before and after
the period of the channel opening. The results showed a gradual increment in the concentration of carbon,
phosphorus and sulphur above 60 cm depth, indicating an increase in the sewage input. The analysis of the
cores showed a strong increase in the concentrations of Hg, Cu, Pb, Zn and Cd, from the layer corresponding
to period of channel opening, while a decrease of Mn and Ni concentrations was observed. These results may
indicate a shift in the oxygenation conditions of the lagoon waters in that time. In the more recent sedimentary
layers the influence of the urbanization process was strongly evidenced.
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The concentration of iodate and iodide were independently determined in seawater samples
from Gua... more The concentration of iodate and iodide were independently determined in seawater samples
from Guanabara Bay (Rio de Janeiro, Brazil) taken at depths from 0.15 to 5 m (which was almost
the bottom), at various times of day and in three different seasons.
The ratio of the two species varied between 0.3 and 3.9, and their concentrations changed at
rates of the order of 10/zM h- 1. This is about two orders of magnitude faster than can be expected
from fluxes from sediments. These rates of variation were highly correlated with biological parameters
such as the rates of photosynthesis and respiration, and concentration of phytoplankton. A
model is presented which explains the diurnal cycling of iodine by biological activity, in agreement
with the observed phenomena.
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This work presents the hydrologic study of the
Perequê-Açu river which passes through Paraty, a c... more This work presents the hydrologic study of the
Perequê-Açu river which passes through Paraty, a city
located at the seashore of Rio de Janeiro state.
The purpose of the study was determination of the
flood discharge of river associated to different return
periods to be used in the hydraulic design of Perequê-
Açu river.
Two different methodologies were adopted: In the
first one, the flood discharges were calculated using the
rainfall runoff method data provided by the intense rainfall
equation of CPRM, selected from the analysis of studies
of the region. In the second one, the flood discharges
were calculated using the probability distribution of a
series of annual highest discharges provided by the Pataty
flow measuring station.
The two methodologies achieved results about
20 percent different. According to these results, the
conservatory one has been adopted as a basis to the
hydraulic study of Perequê-Açu concerning to its urban
area to a 20 year return period as determinated by the
second methodology.
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Journal of The Brazilian Chemical Society, 2004
A simple method for measuring trace levels of Pb in bone by electrothermal atomic absorption spec... more A simple method for measuring trace levels of Pb in bone by electrothermal atomic absorption spectrometry is described. It is shown that Pb can be accurately measured with good precision and accuracy using external calibration with aqueous Pb analytical solutions containing NH4H2PO4 as modifier. The detection limit was found to be 0.07 ng mL-1, corresponding to 0.022 mg g-1 in the original sample. Consequently, the limit of quantification was found to be 0.23 ng mL-1. The precision of the procedure, expressed by the relative standard deviation, was 3.5% for 400 ng Pb in sample measurements. The accuracy of the procedure was confirmed by the good concordance between found and certified values in the analysis of a bone meal certified reference material, NIST SRM 1846.
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Environmental Monitoring and Assessment, 2009
This work discusses the temporal variation of metal concentrations in a hypertrophic coastal lago... more This work discusses the temporal variation of metal concentrations in a hypertrophic coastal lagoon located in the metropolitan area of Rio de Janeiro (Brazil). The lagoon watershed includes one of the mostly densely urbanized areas of the city but without industrial activities. Six sediment cores were collected in the lagoon between May and July 2003 and analyzed for the concentration of metals (Fe, Al, Mn, Zn, Pb, Cu, Cr, and Ni). Typical sedimentation rate was calculated as being 0.75 cm year − 1 and was uniform for at least the past 70 years. Therefore, the alterations in the dynamics of the lagoon caused by changes in its watershed were clearly indicated in sediment cores. The construction of an artificial canal to the sea and the increasing urbanization and soil use changes were the major factors affecting metal accumulation in the lagoon sediments. Metals typical of anthropogenic urban sources (Pb, Zn, and Cu) showed increasing loads following urbanization.
Bookmarks Related papers MentionsView impact
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Papers by Friedrich Herms
water in Sepetiba Bay. Have an historic of many industries with heavy metals discharges in
expressive quantities; this is the most important source of heavy metals trough Sepetiba Bay.
The major importance of the Guandu river in the region concern in your draining basin areas of eight
cities, being responsible for carrier to the bay a sedimentary charge of about 75% of total, response
also about 70% of treated waters and 25% of electric energy used in the Rio de Janeiro state.
This work trough chemicals and mineralogy analysis in eight stations in the Guandu River,
have the main objective understand with major clarity, the anthropogenic influence of Ni, Fe,
Zn, Al, Pb, Cu e Cd trough the river, identifying the input points and with understanding the
Guandu River as a carrier of metals.
Trough data analyses and correlation between parameters we searched the comportment
and concentrations of metals. Correlation of metals with Al and Fe were not possible. Highest
values are found for Al in Rio-Santos route till estuarine zone, Pb in Rio-Santos route and
railroad, crossing Guandu in county of Seropédica and Japeri, Zn in Rio-Santos, Dutra and limit
and Seropédica and Japeri, and Cu in Dutra route in the bridge between Seropédica and Japeri.
Ni present in highest concentration in Dutra route, this values showing have associations with
industrials activities. The station in Dutra route shows the highest values for many of metals
and should be compared with the polluted river Reno in Germany.
The highest variation of values found trough river sediments take conclusion that anthropogenic
pollution is the principal characteristic the environment in study.
lagoon located in the south zone of Rio de Janeiro City. The Rodrigo de Freitas Lagoon watershed includes a
highly urbanized area without industrial activities. The only connection with the sea is a channel constantly
dredged due to siltation. Six sediment cores were collected in the lagoon between May and July of 2003. The
concentration of the heavy metals (Fe, Al, Mn, Hg, Zn, Pb, Cu, Cd, Cr e Ni) in the sediment was analysed.
With the objective of better understanding the behaviour of the metals along the sedimentary column, other complementary parameters were analysed, such as: organic matter and fine fraction contents, concentration
of carbon, nitrogen, phosphorous and sulphur in the sediment; and determination of the sedimentation rate
through the 210Pb method. The sedimentation rate of a sediment core from the lagoon central area was estimated
as 0.75 cm year-1, indicating that a 60 cm layer was deposited since approximately 1923. The alterations in the
environmental quality of the Lagoon caused by anthropogenic activities were clearly evidenced. The results
showed significant changes in the perceptuals of fine fraction and organic matter contents before and after
the period of the channel opening. The results showed a gradual increment in the concentration of carbon,
phosphorus and sulphur above 60 cm depth, indicating an increase in the sewage input. The analysis of the
cores showed a strong increase in the concentrations of Hg, Cu, Pb, Zn and Cd, from the layer corresponding
to period of channel opening, while a decrease of Mn and Ni concentrations was observed. These results may
indicate a shift in the oxygenation conditions of the lagoon waters in that time. In the more recent sedimentary
layers the influence of the urbanization process was strongly evidenced.
from Guanabara Bay (Rio de Janeiro, Brazil) taken at depths from 0.15 to 5 m (which was almost
the bottom), at various times of day and in three different seasons.
The ratio of the two species varied between 0.3 and 3.9, and their concentrations changed at
rates of the order of 10/zM h- 1. This is about two orders of magnitude faster than can be expected
from fluxes from sediments. These rates of variation were highly correlated with biological parameters
such as the rates of photosynthesis and respiration, and concentration of phytoplankton. A
model is presented which explains the diurnal cycling of iodine by biological activity, in agreement
with the observed phenomena.
Perequê-Açu river which passes through Paraty, a city
located at the seashore of Rio de Janeiro state.
The purpose of the study was determination of the
flood discharge of river associated to different return
periods to be used in the hydraulic design of Perequê-
Açu river.
Two different methodologies were adopted: In the
first one, the flood discharges were calculated using the
rainfall runoff method data provided by the intense rainfall
equation of CPRM, selected from the analysis of studies
of the region. In the second one, the flood discharges
were calculated using the probability distribution of a
series of annual highest discharges provided by the Pataty
flow measuring station.
The two methodologies achieved results about
20 percent different. According to these results, the
conservatory one has been adopted as a basis to the
hydraulic study of Perequê-Açu concerning to its urban
area to a 20 year return period as determinated by the
second methodology.
water in Sepetiba Bay. Have an historic of many industries with heavy metals discharges in
expressive quantities; this is the most important source of heavy metals trough Sepetiba Bay.
The major importance of the Guandu river in the region concern in your draining basin areas of eight
cities, being responsible for carrier to the bay a sedimentary charge of about 75% of total, response
also about 70% of treated waters and 25% of electric energy used in the Rio de Janeiro state.
This work trough chemicals and mineralogy analysis in eight stations in the Guandu River,
have the main objective understand with major clarity, the anthropogenic influence of Ni, Fe,
Zn, Al, Pb, Cu e Cd trough the river, identifying the input points and with understanding the
Guandu River as a carrier of metals.
Trough data analyses and correlation between parameters we searched the comportment
and concentrations of metals. Correlation of metals with Al and Fe were not possible. Highest
values are found for Al in Rio-Santos route till estuarine zone, Pb in Rio-Santos route and
railroad, crossing Guandu in county of Seropédica and Japeri, Zn in Rio-Santos, Dutra and limit
and Seropédica and Japeri, and Cu in Dutra route in the bridge between Seropédica and Japeri.
Ni present in highest concentration in Dutra route, this values showing have associations with
industrials activities. The station in Dutra route shows the highest values for many of metals
and should be compared with the polluted river Reno in Germany.
The highest variation of values found trough river sediments take conclusion that anthropogenic
pollution is the principal characteristic the environment in study.
lagoon located in the south zone of Rio de Janeiro City. The Rodrigo de Freitas Lagoon watershed includes a
highly urbanized area without industrial activities. The only connection with the sea is a channel constantly
dredged due to siltation. Six sediment cores were collected in the lagoon between May and July of 2003. The
concentration of the heavy metals (Fe, Al, Mn, Hg, Zn, Pb, Cu, Cd, Cr e Ni) in the sediment was analysed.
With the objective of better understanding the behaviour of the metals along the sedimentary column, other complementary parameters were analysed, such as: organic matter and fine fraction contents, concentration
of carbon, nitrogen, phosphorous and sulphur in the sediment; and determination of the sedimentation rate
through the 210Pb method. The sedimentation rate of a sediment core from the lagoon central area was estimated
as 0.75 cm year-1, indicating that a 60 cm layer was deposited since approximately 1923. The alterations in the
environmental quality of the Lagoon caused by anthropogenic activities were clearly evidenced. The results
showed significant changes in the perceptuals of fine fraction and organic matter contents before and after
the period of the channel opening. The results showed a gradual increment in the concentration of carbon,
phosphorus and sulphur above 60 cm depth, indicating an increase in the sewage input. The analysis of the
cores showed a strong increase in the concentrations of Hg, Cu, Pb, Zn and Cd, from the layer corresponding
to period of channel opening, while a decrease of Mn and Ni concentrations was observed. These results may
indicate a shift in the oxygenation conditions of the lagoon waters in that time. In the more recent sedimentary
layers the influence of the urbanization process was strongly evidenced.
from Guanabara Bay (Rio de Janeiro, Brazil) taken at depths from 0.15 to 5 m (which was almost
the bottom), at various times of day and in three different seasons.
The ratio of the two species varied between 0.3 and 3.9, and their concentrations changed at
rates of the order of 10/zM h- 1. This is about two orders of magnitude faster than can be expected
from fluxes from sediments. These rates of variation were highly correlated with biological parameters
such as the rates of photosynthesis and respiration, and concentration of phytoplankton. A
model is presented which explains the diurnal cycling of iodine by biological activity, in agreement
with the observed phenomena.
Perequê-Açu river which passes through Paraty, a city
located at the seashore of Rio de Janeiro state.
The purpose of the study was determination of the
flood discharge of river associated to different return
periods to be used in the hydraulic design of Perequê-
Açu river.
Two different methodologies were adopted: In the
first one, the flood discharges were calculated using the
rainfall runoff method data provided by the intense rainfall
equation of CPRM, selected from the analysis of studies
of the region. In the second one, the flood discharges
were calculated using the probability distribution of a
series of annual highest discharges provided by the Pataty
flow measuring station.
The two methodologies achieved results about
20 percent different. According to these results, the
conservatory one has been adopted as a basis to the
hydraulic study of Perequê-Açu concerning to its urban
area to a 20 year return period as determinated by the
second methodology.