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Method for detecting heavy metals in wastewater

A detection method and heavy metal technology, which is applied in the field of analytical chemistry, can solve the problems of low detection results and difficulty in accurately detecting heavy metals, and achieve the effects of improving sensitivity, detection accuracy, and integrity

Inactive Publication Date: 2016-09-28
ZHEJIANG HANGKANG TESTING TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, heavy metal residues in the system during the determination will inevitably lead to low detection results
At the same time, when the content of heavy metals in wastewater is low, the sensitivity of the instrument is difficult to accurately measure the concentration of heavy metals. It is necessary to test multiple sets of experiments to objectively show the concentration of heavy metals in wastewater.

Method used

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  • Method for detecting heavy metals in wastewater
  • Method for detecting heavy metals in wastewater
  • Method for detecting heavy metals in wastewater

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] Example 1, randomly select a bottle of collection liquid, set up three groups of parallel experiments to carry out the following steps:

[0032] Step S1, take 100ml of collection liquid and use a laboratory vacuum filtration device to carry out vacuum filtration through a 4.5 micron filter membrane and use a 100ml test tube to receive 70-80ml of filtrate, and use a pipette to remove part of the filtrate from the test tube to obtain the remaining 50ml for testing liquid;

[0033] Step S2, pour the solution to be tested obtained in step S1 into a polytetrafluoroethylene tube, and add 25ml of secondary deionized water to rinse the test tube and add it into the polytetrafluoroethylene tube;

[0034] Step S3, use a 2ml pipette to transfer 2ml of concentrated nitric acid with a concentration of 16mol / L into the polytetrafluoroethylene tube, take another 2ml pipette to transfer 1.5ml hydrogen peroxide into the polytetrafluoroethylene tube, and use a glass dropper to transfer t...

Embodiment 2

[0040] Example 2, select a bottle of collection solution with low mass concentration, and set up three groups of parallel experiments to perform the following steps:

[0041] Step S1, take 100ml of collection liquid and use a laboratory vacuum filtration device to carry out vacuum filtration through a 4.5 micron filter membrane and use a 100ml test tube to receive 70-80ml of filtrate, and use a pipette to remove part of the filtrate from the test tube to obtain the remaining 50ml for testing liquid;

[0042] Step S2, pour the solution to be tested obtained in step S1 into a polytetrafluoroethylene tube, and add 25ml of secondary deionized water to rinse the test tube and add it into the polytetrafluoroethylene tube;

[0043] Step S3, use a 2ml pipette to transfer 2ml of concentrated nitric acid with a concentration of 16mol / L into the polytetrafluoroethylene tube, take another 2ml pipette to transfer 1.5ml hydrogen peroxide into the polytetrafluoroethylene tube, and use a glas...

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Abstract

The invention discloses a method for detecting heavy metals in wastewater, which is used for solving the problem that the detection accuracy of heavy metals in wastewater is low, particularly the problem that the detection deviation is large when the content of heavy metals in the wastewater is low. According to the technical scheme, the invention discloses a method for detecting heavy metals in wastewater. The method comprises the following steps: step S1, filtering a certain amount of collected liquid, and containing 25-50ml of to-be-detected liquid by using a test tube; step S2, putting the to-be-detected liquid into a polytetrafluoroethylene tube, pouring flushing fluid into the polytetrafluoroethylene tube by using a 50ml flushing test tube, adding 1-2ml digestion liquid for performing high-temperature dissolution for 1-3 hours, and cooling, thereby obtaining dissolved liquid; step S3, filtering the dissolved liquid, washing, and diluting to a certain volume, thereby obtaining a test sample; and step S4, performing qualitative and quantitative analysis on heavy metals in the test sample by adopting a flame atomic absorption spectrometer. Therefore, the detection precision of heavy metals in the wastewater is improved.

Description

technical field [0001] The invention relates to the technical field of analytical chemistry, in particular to a method for detecting heavy metals in wastewater. Background technique [0002] Heavy metals are a kind of common pollutants. Once they enter the water body, they can easily enter the human body through bioaccumulation and accumulation, causing damage to tissues and organs. At present, instruments such as atomic fluorescence, atomic absorption spectroscopy, and inductively coupled plasma-mass spectrometry are not suitable for rapid online monitoring of heavy metals in water due to their high price and inconvenient operation. Based on the anodic stripping voltammetry online monitor, due to the characteristics of low cost, high sensitivity, strong anti-interference ability, fast and convenient, it is one of the important means for the rapid monitoring of heavy metals in water quality in the future. [0003] At present, most water quality online analysis monitors use ...

Claims

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Application Information

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IPC IPC(8): G01N21/31
CPCG01N21/3103
Inventor 徐敏妤
Owner ZHEJIANG HANGKANG TESTING TECH CO LTD
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