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Water metal total amount digestion method

A metal and total amount technology, which is applied in the field of digestion of the total amount of metals in water quality, to achieve the effect of stable method and good digestion

Inactive Publication Date: 2016-11-23
ANHUI INNOVATION TESTING TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, there is no stable and accurate digestion method

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0011] prepare water sample

[0012] Step 1, prepare digestion solution 1: concentrated nitric acid of 5.0mlρ(HNO3)=1.42g / ml and digestion solution 2: concentrated nitric acid of 4.0ml and concentrated hydrochloric acid of 1.0mlρ(HCl)=1.19g / ml;

[0013] Step 2: Measure 25ml of a well-mixed water sample into a microwave digestion tank, add 1.0ml of ω(H2O2)=30% hydrogen peroxide, select digestion solution 1 or digestion solution 2 according to the analysis element, observe the solution, if there are a lot of bubbles Produced, placed in a fume hood to stand still, after the reaction is stable, cover and tighten. Put it into a microwave digestion instrument, the general power is 600-1500W. After the mixture of water sample and acid absorbs microwave energy, the oxidation reaction activity of the acid increases, and the metal elements in the sample are released into the solution, and the digestion is carried out according to the recommended heating program.

[0014] Step 3. After ...

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Abstract

The invention relates to a water metal total amount digestion method. The method includes the steps that firstly, a first digestion solution and a second digestion solution are prepared, wherein the first digestion solution is 5.0 ml of concentrated nitric acid, and the second digestion solution is prepared from 4.0 ml of concentrated nitric acid and 1.0 ml of concentrated hydrochloric acid; secondly, a 25 ml evenly mixed water sample is weighed and placed in a microwave digestion tank, 1.0 ml of hydrogen peroxide is added, the first digestion solution or the second digestion solution is selected according to analysis elements, the solution is observed, if a large quantity of bubbles are generated, the solution is placed in a ventilation cabinet and stands still, after reaction is stable, a cap is added and screwed, the product is placed in a microwave digestion instrument, and digestion is conducted according to a recommended heating program; thirdly, the product is taken out of the digestion tank after the program execution and placed in the ventilation cabinet to be cooled, after temperature in the tank and room temperature are balanced, air is exhausted, the cap is opened, the digestion solution in the tank is moved out, the inner wall of the digestion tank is washed twice with experiment water, all solutions are collected and transferred into a 50 ml volumetric flask, and water is added to a marked line for measuring. The digestion method is stable and precise, and water metal can be well digested.

Description

technical field [0001] The invention relates to a method for digesting the total amount of metal in water. Background technique [0002] The arbitrary discharge of industrial pollutants and waste water, the widespread application of pesticides and insecticides in agricultural production, and the corrosion of urban water supply pipe networks have all caused heavy metal pollution in water quality. Due to the wide variety of metal ions and complex components, most of them contain toxic or harmful substances, and cannot be degraded by microorganisms in the environment, they will gradually enrich through the food chain, and are highly toxic to humans and organisms. It is of great significance to study the mechanism of removing water quality metals. [0003] In the past, the digestion of water-quality metals was only done through chemical formulas, but the harmful metals remaining due to external factors still exist. At present, there is no stable and accurate digestion method. ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N1/28G01N1/44
CPCG01N1/28G01N1/44
Inventor 葛辉付珍张文舒
Owner ANHUI INNOVATION TESTING TECH CO LTD