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Method for determining concentration of cyanides in environment

A cyanide and environmental technology, applied in material excitation analysis, thermal excitation analysis, etc., can solve the problems of color change being easily affected by subjective factors, high proficiency requirements, and low cyanide lethality, so as to reduce environmental and Hazards to operator health, simple analysis method, high recovery effect

Active Publication Date: 2013-08-07
浙江中一检测研究院股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method requires a high degree of proficiency for the operator, and the color change is easily affected by subjective factors, and errors are prone to occur. Because the lethal dose of cyanide is very low, this error is often unacceptable

Method used

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  • Method for determining concentration of cyanides in environment
  • Method for determining concentration of cyanides in environment
  • Method for determining concentration of cyanides in environment

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] Embodiment 1, the detection of cyanide concentration in the workshop air of a certain factory

[0025] Step 1: Collect cyanide samples in the workshop air with a filter membrane, collect 100L of air at a flow rate of 5L / min, and collect blank control samples at the same time;

[0026] Step 2: Transfer the collected air sample into a water sample bottle, add concentrated phosphoric acid and MgCl 2 Solution, cover the cork immediately and start pumping, the flow rate of the atmospheric sampler is 5L / min, stop pumping after 15min;

[0027] Step 3: The released HCN is collected by multi-stage series absorption bottles, and the absorption liquid is an equal volume of 0.5mg / L Mn 2+ ions and 0.5mg / L phenanthroline (phen) mixed metal ion complexing agent, the absorption solution needs to be adjusted to pH 6 before use;

[0028] Step 4: Transfer the absorption solution into a centrifuge tube with a stopper, add ethanol and carbon tetrachloride, then extract it ultrasonically, ...

Embodiment 2

[0033] Embodiment 2, the determination of cyanide concentration in certain factory waste water

[0034] Step 1: Collect 500mL of wastewater samples in glass bottles;

[0035] Step 2: Transfer the collected water sample into a water sample bottle, add concentrated phosphoric acid and MgCl 2 Solution, cover the cork immediately and start pumping, the flow rate of the atmospheric sampler is 5L / min, stop pumping after 15min;

[0036] Step 3: The released HCN is collected by a multi-stage series absorption bottle, and the absorption liquid is an equal volume of 0.8mg / L Ni 2+ ions and 1.0 mg / L triethanolamine as a metal ion complexing agent, and the pH of the absorption solution should be adjusted to 7 before use;

[0037] Step 4: Transfer the absorption solution into a centrifuge tube with a stopper, add ethanol and carbon tetrachloride, then extract it ultrasonically, then centrifuge, use a micro-injector to absorb the extractant and inject it into another dry and clean test tub...

Embodiment 3

[0042] Embodiment 3, the determination of cyanide concentration in the soil around enterprises in a certain city

[0043] Step 1: directly collect 50g of soil samples;

[0044] Step 2: Transfer the collected soil sample into a water sample bottle, add concentrated phosphoric acid and MgCl 2 Solution, cover the cork immediately and start pumping, the flow rate of the atmospheric sampler is 5L / min, stop pumping after 15min;

[0045] Step 3: The released HCN is collected by multi-stage series absorption bottles, and the absorption liquid is an equal volume of 0.5mg / L Mn 2+ ions and 0.5mg / L phenanthroline (phen) mixed metal ion complexing agent, the absorption solution needs to be adjusted to pH 8 before use;

[0046] Step 4: Transfer the absorption liquid into a centrifuge tube with a stopper, add ethanol and carbon tetrachloride, then extract it ultrasonically, then centrifuge, use a micro-injector to absorb the extractant and inject it into another dry and clean test tube, an...

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Abstract

The invention provides a method for determining the concentration of cyanides in an environment. The method comprises the following steps of: collecting the cyanides in the environment, adding an acid, extracting gas, releasing HCN, complexing and absorbing the released HCN by adopting metal ions, performing liquid extraction on an absorption solution by a dispersion solution, then determining the content of the metal ions by using an atomic absorption spectroscopy method, and further indirectly determining the concentration of the cyanides in the environment, wherein the cyanides in the environment comprise the cyanides in water, air and soil. By using the method provided by the invention, the enrichment factor is high, the safety is realized, harm to the environment and health of operation staff is greatly reduced, the method is environment-friendly, and the analytical method further has the characteristics of accuracy, high speed (10-20min), small interference and low detection limit.

Description

technical field [0001] The invention relates to a method for measuring the concentration of cyanide in the environment, in particular to a method for indirectly measuring the concentration of cyanide in the environment by metal ion complex atomic absorption spectrometry. [0002] Background technique [0003] There are many sources of cyanide in the environment, mainly from electroplating, metallurgy, mineral processing, printing, coking and petrochemicals. Cyanide is highly toxic, and very small amounts of cyanide are fatal to humans. [0004] All countries in the world have strict regulations on the concentration of cyanide in the environment. The World Health Organization stipulates that the maximum content of cyanide in drinking water is 1.9μM (0.44ppm). Therefore, it is of great significance to accurately and quickly detect the concentration of cyanide in the environment. [0005] At present, the methods used for the determination of cyanide mainly include volumetric ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N21/72
Inventor 何莲井瑜张学刚梅宇李丹霞徐静
Owner 浙江中一检测研究院股份有限公司