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Rapid detection agent of total chromium

A detection agent and rapid technology, applied in the field of detection agent preparation and use methods, can solve the problems of difficult online operation, low sensitivity, complicated operation, etc., and achieve the effects of sensitive response, high chromium conversion rate, and convenient carrying and use

Active Publication Date: 2015-02-04
上海绿帝环保科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Ferrous ammonium sulfate titration method is mainly used for the determination of high concentration chromium in water, but the sensitivity is low, the operation is complicated, and it is difficult to realize online operation

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0012] Example 1 Preparation of rapid detection reagent for total chromium

[0013] Weigh 5g of manganese dioxide powder, add 100ml of ethanol, stir for 30min, filter, collect the filter cake, add 10g of polyethylene glycol melted at 60°C, mix well, cool and pulverize, mix with 10g of sodium acetate and 10g of lithium hydroxide Evenly, manganese oxide powder is obtained. Measure 20ml of phosphoric acid and 100g of sodium sulfate, mix evenly, dry in an oven at 110 degrees for 2 hours, cool and crush, take 0.2g of it, mix and grind it with 1mg of diphenylcarbazide and 0.1g of sulfamic acid to obtain toner.

Embodiment 2

[0014] Example 2 Determination of Total Chromium Concentration in a River Water

[0015] Take 5ml of river water in a 5ml colorimetric tube, add 0.1g of manganese oxide powder, shake the colorimetric tube for 2 minutes, filter, add 0.3g of color developing powder to the filtrate, shake to dissolve, let it stand for 5 minutes, and use a 30mm The absorbance of the cuvette was measured at 540nm, and the calculated total chromium concentration in the water sample was 0.135mg / L, which was consistent with the detection result of 0.137mg / L by the ICP-OES method, indicating that the total chromium rapid detection reagent is accurate and reliable.

Embodiment 3

[0016] Example 3 Determination of total chromium content in table salt

[0017] Weigh 0.2g of edible salt into a 5ml colorimetric tube, add 5ml of purified water, mix and dissolve, add 0.1g of manganese oxide powder, shake the colorimetric tube for 2min, filter, add 0.3g of color developing powder to the filtrate, shake to dissolve, and place For 5 minutes, measure the absorbance at 540nm with a 30mm cuvette on a 721-type spectrophotometer, and calculate the total chromium content in table salt to be 0.023mg / kg, which is consistent with the ICP-OES detection result of 0.021mg / kg, indicating that the total chromium The rapid detection agent is accurate and reliable for salt detection.

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PUM

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Abstract

The invention discloses a rapid detection agent of total chromium, and relates to a rapid quantitative determination technology for total chromium content in water body and water-soluble food. The detection agent is composed of manganese oxide powder which is formed by mixing manganese dioxide, sodium acetate, lithium hydroxide and the like, and color-developing powder which is composed of diphenylcarbazide, sulfamic acid and phosphoric acid. When the rapid detection agent is in use, 0.05-0.2 g of the manganese oxide powder is added in 5 ml of a water sample; the manganese oxide powder and the water sample are mixed and then filtered; 0.1-0.5 g of the color-developing powder is added in a filtrate; the filtrate is shaken until the color-developing powder is dissolved; a spectrophotometer or a chromometer is used to measure the total chromium content after 5 minutes, and thus a total chromium concentration in a sample can be obtained. For solid food, 0.1-0.5 g of the solid food is pre-weighed and dissolved in 5 ml of purified water, and then the total chromium content is determined according the above steps. The rapid detection agent of total chromium has the characteristics that (1) chromium conversion rate is high and the rapid detection agent is suitable for detection of the total chromium content ranging from 0.01 mg / L to 0.5 mg / L in various media; and (2) the rapid detection agent is stable in properties and convenient to carry and use.

Description

technical field [0001] The invention relates to a method for preparing and using a detection agent for rapidly detecting total chromium, and belongs to the technical field of environmental monitoring. Background technique [0002] With the rapid development of the automobile industry, steel industry, leather industry, printing and dyeing industry and other industries, heavy metal pollution has become increasingly serious. Among them, chromium (Cr) has been included in China's blacklist of environmental priority pollutants due to its high toxicity. Due to the long-term cumulative effect and interaction of heavy metal chromium pollution, which has the characteristics of poor mobility and non-degradability, when a large amount of chromium enters the soil, it will gradually have a negative impact on the physical and chemical properties of the soil and soil productivity, and then affect the soil ecological structure. and functional stability. After the soil is polluted by heavy ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N21/25G01N21/31
Inventor 郜子涵郜子蕙
Owner 上海绿帝环保科技有限公司
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