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A method and device for measuring carbon disulfide

A carbon disulfide and determination method technology, applied in the field of environmental science, can solve the problems of unstable results, can not well meet the requirements of trace analysis, low sensitivity, etc., and achieve the effect of fast determination

Inactive Publication Date: 2019-10-15
TIANJIN NORMAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The former is troublesome to operate, while the latter has low sensitivity and the presence of H 2 S and other interference, can not well meet the requirements of trace analysis in environmental samples
The latter result is unstable, and the detection limit difference

Method used

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  • A method and device for measuring carbon disulfide
  • A method and device for measuring carbon disulfide

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] (1) Use a gas sampler to collect 50 liters of a workplace gas sample, so that the carbon disulfide in the gas sample is absorbed by the excess sodium hydroxide (pH=13) and diethylamine (40mM) mixed solution, and then use a peristaltic pump to Extract the above-mentioned absorption solution at a flow rate of 1.2 ml / min, and at the same time extract a hydrochloric acid solution with an acidity of 0.2 M at a certain flow rate, adjust the flow rate of the acid injection tube so that the final acidity of the two mixed solutions is at 0.05 M. Make the two solutions according to the instructions attached figure 1 The injection devices are combined in a tee to react.

[0036] (2) The generated volatiles and the reacted solution are attached to the instructions figure 1 The gas-liquid separator in the sampling device is used for separation;

[0037] (3) The separated DDTC acid volatiles were introduced into a non-dispersive atomic fluorescence photometer for light dispersion me...

Embodiment 2

[0039] (1) Add excess sodium hydroxide and diethylamine to 100ml of an aqueous solution sample to be tested (so that the concentration of sodium hydroxide after mixing is 0.15M, and diethylamine is 100mM), and then use a peristaltic pump at 1.7ml / min Extract the above-mentioned absorption solution at the same flow rate, and at the same time extract a nitric acid solution with an acidity of 0.2 M and containing 20ppb zinc. Make the two solutions according to the instructions attached figure 1 The injection devices are combined in a tee to react.

[0040] (2) The generated volatiles and the reacted solution are attached to the instructions figure 1 The gas-liquid separator in the sampling device is used for separation;

[0041] (3) The separated DDTC-zinc volatiles were introduced into a non-dispersive atomic fluorescence photometer for atomic fluorescence measurement, and the linear relationship between the fluorescence intensity of zinc and the concentration of carbon sulfide...

Embodiment 3

[0043] A device for the formation of elemental volatiles,

[0044] The device includes an acid (or element-containing acid) solution introduction pipe 1, an introduction pipe 2 of a diethyldithiocarbamate solution containing carbon disulfide, a peristaltic pump 3, 3', a three-way pipe 4, and a gas-liquid separator 5. Carrier gas inlet 6, carrier gas outlet 7 and waste liquid discharge pipe 8; the first peristaltic pump 3 is connected to the gas-liquid separator 5 through a tee 4, and the gas-liquid separator 5 has a diameter of 30 cm near the bottom 1. Porous air-permeable and water-impermeable membrane plate 9 with an aperture of 80 mesh. When the mixed solution flows through the membrane plate, the solution above is bubbled by the carrier gas below the membrane plate, thereby performing gas-liquid separation.

[0045]Among them, the flow rate of the acidic solution (or element-containing acidic solution) introduction pipe (1) and the introduction pipe (2) of the diethyldithi...

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Abstract

The invention discloses a determination method and device of carbon disulfide. The method comprises the following steps: absorbing carbon disulfide through an excess alkaline ethylenediamine solution, enabling the carbon disulfide and alkaline and ethylenediamine to be reacted with each other, so as to produce a soluble ethylenediamine dithiocarbamate product, enabling the ethylenediamine dithiocarbamate product in absorption liquid to be mixed and reacted with an acid solution (or elements in the acid solution), so as to produce volatile matter with volatility, performing rapid gas-liquid separation on a solution containing the volatile matter, so as to enable separated volatile gas to determine the concentration of carbon disulfide through a light scattering method (or an atomic spectrometry method). The invention further discloses a determination device of carbon disulfide, which mainly leads carrier gas from the lower surface of a template to perform bubbling on a solution when the mixed solution flows through the upper surface of the template, so as to perform gas-liquid separation. The separated volatile matter is applied to the preparation of atomic spectrum gaseous inlet samples or chemical vapor deposition precursor.

Description

technical field [0001] The invention belongs to the field of environmental science, in particular to a method and device for measuring carbon disulfide. Background technique [0002] Carbon disulfide is a colorless or yellow volatile toxic liquid, which can be used to manufacture products such as viscose fiber, carbon tetrahydrochloride, and accelerators. It is also a widely used organic solvent, and its boiling point is low (4.63 ℃ ) , Flammable and explosive (explosive limit: lower limit 1.25%, upper limit 44%). After carbon disulfide gas invades the human body through the respiratory tract, it will cause headaches, dizziness, general weakness, visual and sensory disturbances, and digestive disorders. In severe cases, it will cause mental disorders. Therefore, the accurate determination of carbon disulfide is of great significance. [0003] The commonly used methods for the determination of carbon disulfide are gas chromatography and absorptiometry. The former is troubl...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N21/51G01N21/31G01N1/34
Inventor 段旭川孙睿房金亮
Owner TIANJIN NORMAL UNIVERSITY