SU593140A1 - Indicating compound for quantitative determination of diethylamine - Google Patents

Description

temperature The resulting indicator mass is placed in Glass tubes with an inner diameter of 2.5-2.6 mm. The length of the layer of mass 70 mm. When air containing pairs of diethylamine is treated with “O-chanting 110 mg / l, a change in the initial pink color and a hollow color occurs through the proposed mass. The dependence of the properties of the indicator mass from sadrge and cobalt chloride is given in table. one.

Table 1

As see from the data table. 1, the aptimal content of cobalt chloride in a mixture of 0.1-0.15 weight. % and with a further decrease in its sensitivity varies little, and the interface deteriorates. The dependence of the length of the indicator mass on the OKpHiCKy layer of the indicator mass on the co-concentration of diethylamine in the vapor-air mixture with a drawn volume of 400 ml is determined.

To study the effect of ammonia on triethylamines on the results of the determination of diethylamine, steam vapor (tazo) air mixtures containing diethylamine, diethylamin in mixture C with triethylamine, and also diethylamine with ammonia were created. The resulting mixtures (pass through the proposed indicator Maos in a volume of 400 ml. It is established

Component

Below are the test results.

Mixture b gd

The length of the layer that changed color, mm 44 4.5 18 18

that triethylamine in concentrations up to 75 kg / m and ammonia up to 210 kg / m (the maximum allowable concentration of these substances is 10 and 20 mg / m, respectively) does not interfere with the determination of diethylamine.

In tab. 3 shows the compositions of the tested artificial mixtures (a- ").

Table 3

Concentration in the vapor (gas) air mixture under study, mg / m

e 3 and 18 36 35 36 The following results are obtained: Diethylamine concentration, mg / m 20406080100120200 The length of the changed layer of the mass, mm4 71015 18 22 35 Determines the dependence of the length of the changed layer of the indicator mass on the soda glass powder and ethyl alcohol, the results are given in table. 2. Table 2

As can be seen 1 of the data table. 3, the proposed indane: ikator "a mass is selective and (it allows with sufficient accuracy the definition of diethylamine in the air of production breakdowns and the simultaneous presence of triethylamine or ammonia.

Claims (2)

The indicator tubes, filled with the proposed mass, make it possible to determine the diethyls by the linear-color method (the length of the color layer that has changed color), which greatly improves the accuracy of determination and allows a more objective assessment of the concentration of diethylamine in the air. Claims of the invention: Indicator mass for quantitative determination of diethyl a, including an inert carrier and a reagent, characterized in that, in order to increase the exact BUT | ST of determination and selectivity of mass, it contains glass powder as an inert carrier, and Cobalt (II) chloride, ethyl alcohol and water as a reagent in the following ratio of components, wt. %: 88.0-90.0 0.05-0.5 2.0-3.0 The rest Sources and / information taken into account during the examination. 1. Author's certificate number 276492, cl. G 01 N 31/00, 1968. 2. Certificate of author number 133267, cl. G 01 N21 / 12, 1960.