Method and device for sequentially injecting lead in online detection of water quality

A sequential injection and water quality technology, which is applied in the fields of chemical analysis and water environment monitoring and analysis, can solve the problems of low detection accuracy, many procedures, and troublesome operation, and achieve the effects of simple instrument system, improved sensitivity, and low failure rate

Inactive Publication Date: 2013-03-27
DELIN ENVIRONMENTAL PROTECTION TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The current detection process of stripping voltammetry is mostly manual operation, with many procedures, troublesome operation, poor reproducibility, low detection accuracy, and cannot adapt to real-time on-line monitoring of lead content in industrial wastewater

Method used

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  • Method and device for sequentially injecting lead in online detection of water quality
  • Method and device for sequentially injecting lead in online detection of water quality
  • Method and device for sequentially injecting lead in online detection of water quality

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Embodiment 1

[0031] The method and process for detecting lead with this device will be described below in conjunction with the accompanying drawings.

[0032] one. Preparation of reagents:

[0033] (1) Preparation of water quality lead standard solution

[0034] Accurately weigh 1.0000 g of pure metallic lead (purity ≥ 99.9%) and dissolve it in 20 ml of nitric acid solution (made from 10 ml of concentrated nitric acid + 10 ml of water), then add water to 1000 ml, and dilute to a nitric acid solution with a concentration of 1000 mg / L , and use this as the mother liquor for later use.

[0035] Accurately pipette 12 ml of the mother liquor into a 500 ml volumetric flask, add distilled water to the mark, shake well, and make a spiked solution with a concentration of 24 mg / L for later use.

[0036] (2) Carrier liquid

[0037] Accurately weigh 11.69 g of sodium chloride in a 1000 ml volumetric flask, add distilled water to dissolve, then add 16.66 ml of concentrated hydrochloric acid, ad...

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Abstract

The invention relates to a method for sequentially injecting lead in online detection of water quality, wherein each step for detecting lead in stripping voltammetry and quantitative dose delivery of required solvent or solution are finished in sequence with sequential injection method; the method comprises the following steps: plating mercury on the surface of a working electrode by using mercury plating liquid HgSO4 solution or Hg(NO3)2 solution; absorbing lead ions in a raw water sample by using polystyrene-dithizone nanofiber; then eluting and condensing into sample water for detection; respectively injecting the sample water and carrier liquid in a electrolytic bath at fixed quantities, wherein the deposition potential is -1.0 to -1.2V, the deposition time is 140-160s, the cleaning potential is -0.3V, and the time is 15s; carrying out anode stripping voltammetry detection on the sample water so as to obtain a sample water stripping voltammetry curve, wherein the stripping peak area is combined with the stripping peak area of a guide sample; and calculating to obtain the lead concentration of sample water. The invention provides a special detection device, which is accurate in fixed quantity and high in sensitivity and can realize online and quick detection of lead content in various water sources.

Description

technical field [0001] The invention relates to a method and a device for sequentially injecting online detection of water quality lead, which are used for automatic online monitoring of water quality lead content and belong to the fields of chemical analysis and water environment monitoring and analysis. Background technique [0002] Lead is a toxic metal that can accumulate in human and animal tissues. Its main toxic effect is to cause anemia, nervous dysfunction and kidney damage. Lead pollution in water systems mainly comes from such as storage batteries, smelting, hardware, machinery, paint or electroplating. Wastewater discharged from industries, etc. Therefore, online monitoring of lead content in industrial wastewater is very necessary. Stripping voltammetry is considered to be an effective method for detecting a trace amount of heavy metal ions. Stripping voltammetry electrolyzes the substance to be tested for a certain period of time under appropriate conditions, ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N27/48G01N1/40
Inventor 洪陵成朱金伟王建伟
Owner DELIN ENVIRONMENTAL PROTECTION TECH
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