SU487333A1

SU487333A1 - Method for the extraction of thallium extraction

Info

Publication number: SU487333A1
Application number: SU1907187A
Authority: SU
Inventors: Мария Ивановна Дементьева; Раиса Ивановна Оглоблина; Галина Николаевна Липунова; Васса Николаевна Подчайнова
Original assignee: Всесоюзный Научно-Исследовательский Институт Охраны Труда Вцспс; Ордена Трудового Красного Знамени Уральский Политехнический Институт Им.С.М.Кирова
Priority date: 1973-04-06
Filing date: 1973-04-06
Publication date: 1975-10-05

Description

него количества других элементов без их предварительного отделеип , повышает точноеть определени . Чуветвительноеть епособа 0,6 мкг/мл. Погрешность измерени 5 отп. %. В таблице приведены результаты извлечени и оиределени талли известным и иредлагаемым способами. Л-la и депо Ошибка,the number of other elements without their preliminary separation increases the accuracy of determination. The accessory dose of the procedure is 0.6 µg / ml. Measurement error 5 off. % The table shows the results of extraction and determination of thallium by known and proposed methods. L-la and depot error,

Способ состоит в следующем.The method consists in the following.

Пробу пылп воздуха обрабатывают сначала концентрированной сол ной кислотой, затем бромной водой, выпаривают досуха на вод ной бане, заливают остаток раствором сол ной кислоты (рН 2,5-5,0), после растворени добавл ют столько раствора формазана в четыреххлористом углероде, сколько необходимо дл заполнени кюветы, встр хивают 1 мин, отдел ют экстракт и фотометрируют при 680-720 нм. Параллельно провод т холостой оиыт и стро т калибровочную кривую.A sample of the air dust is treated first with concentrated hydrochloric acid, then with bromine water, evaporated to dryness in a water bath, the residue is poured with a solution of hydrochloric acid (pH 2.5-5.0), after dissolving so much formazan solution in carbon tetrachloride is added Needed to fill the cuvette, shake for 1 minute, extract the extract and photometer at 680-720 nm. In parallel, a blank is conducted and a calibration curve is constructed.

Содержание талли в анализируемой пробе наход т по формуле:The content of thallium in the analyzed sample is found by the formula:

а . 1/, . I/but . one/, . I /

С WITH

Предмет и з о б р е т е и и Subject and d on and e and

Claims

1. A method for extracting the thallus of CZ acidic solutions, mainly for its subsequent determination in air, with an organic solvent in the form of a colored complex of trivalent thallium with formazan derivatives, characterized in that, for the purpose of increasing the selectivity of the determination; 1 (1-benzylbenzimndazolyl2) -3-me1yl-5- / g-nitrophenylformazap.

2. The method according to claim 1, wherein those using carbon tetrachloride as the orgamic solvent.

3. The method according to claim 1, characterized in that the extraction of the thallium complex with the zap form is carried out from the acidic solution with a pH preferably equal to 2.5-5.0 m. where C is the content of tally E my sample, mg; n is the content of tall B extract, found by the calibration curve, mg / ml, b is the volume of the sample taken for analysis, ml; V - total volume of the sample, ml Vi - volume of the extract, ml. Example. The optical density of the obtained extract at 680 nm is 0.105. content of talPo calibration 9.3 μg1ml. The volume of extract in the extract is 5 ml of extract (/), sample volume taken, analysis (b), 5 ml, total sample volume (/) 5 ml. Substitute these values in the formula, half an hour :, that the total amount in the sample is 0.0-165 mg.