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A rapid on-site detection method for chromium ions in water that can eliminate the influence of reagent blanks

A detection method, the technology of chromium ions, is applied in the direction of material analysis by observing the influence on chemical indicators, and analysis by making materials undergo chemical reactions, which can solve the problems of difficult effective control of dissolution time and inability to eliminate reagent blanks, etc. Achieve the effect of high accuracy, easy operation, and eliminate influence

Active Publication Date: 2018-04-24
WENZHOU MEDICAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The purpose of the embodiments of the present invention is to provide a rapid on-site detection method for chromium ions in water that can eliminate the influence of reagent blanks, so as to achieve rapid and accurate on-site determination of chromium ions in water, and overcome the problem of dissolution time when using dry powder detection reagents in the prior art Due to the difference, it is difficult to effectively control the detection time. Because the standard color card that does not deduct the reagent blank is used, the standard color card is directly compared with the sample tube to obtain the result during color comparison, and the fluctuation of the reagent blank cannot be eliminated, which will adversely affect the accuracy of the test results. Shortcomings

Method used

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  • A rapid on-site detection method for chromium ions in water that can eliminate the influence of reagent blanks
  • A rapid on-site detection method for chromium ions in water that can eliminate the influence of reagent blanks

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Experimental program
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Effect test

Embodiment 1

[0039] Step 1. Weigh 2g of diphenylcarbazide and 20g of phthalic anhydride, add 800ml of 150mmol / L pH2.0 glycine-hydrochloric acid buffer and stir to dissolve, then add 0.02ml TritonX-100 and 10ml of ethylene glycol, stir to dissolve Afterwards, dilute to 1000ml with 150mmol / L pH2.0 glycine-hydrochloric acid buffer solution to obtain 1000ml containing 2g / L diphenylcarbazide, 20g / L phthalic anhydride, 0.02ml / L TritonX-100, 10ml / L Ethylene glycol 150mmol / L pH2.0 glycine-hydrochloric acid buffer is a liquid chromium ion detection reagent;

[0040] Step 2: Take seven 10ml glass colorimetric tubes, set the first colorimetric tube as a blank tube, and the second to seventh colorimetric tubes as standard tubes, add 10ml deionized water and 10ml into the blank tube and standard tube respectively Chromium ion standard solution with a concentration of 0.05mg / L, 0.10mg / L, 0.20mg / L, 0.40mg / L, 0.60mg / L, 0.80mg / L, and then add the liquid chromium ion detection reagent described in step 1 0...

Embodiment 2

[0046] Step 1. Weigh 6g of diphenylcarbazide and 40g of phthalic anhydride, add 800ml of 150mmol / L pH2.0 glycine-hydrochloric acid buffer and stir to dissolve, then add 0.05ml TritonX-100 and 20ml of ethylene glycol, stir to dissolve Afterwards, dilute to 1000ml with 150mmol / L pH2.0 glycine-hydrochloric acid buffer solution to obtain 1000ml containing 6g / L diphenylcarbazide, 40g / L phthalic anhydride, 0.05ml / L TritonX-100, 20ml / L Ethylene glycol 150mmol / L pH2.0 glycine-hydrochloric acid buffer is a liquid chromium ion detection reagent;

[0047] Step 2: Take seven 10ml glass colorimetric tubes, set the first colorimetric tube as a blank tube, and the second to seventh colorimetric tubes as standard tubes, add 10ml deionized water and 10ml into the blank tube and standard tube respectively Chromium ion standard solution with a concentration of 0.05mg / L, 0.10mg / L, 0.20mg / L, 0.40mg / L, 0.60mg / L, 0.80mg / L, and then add the liquid chromium ion detection reagent described in step 1 0...

Embodiment 3

[0053] Step 1. Weigh 10g of diphenylcarbazide and 60g of phthalic anhydride, add 800ml of 150mmol / L pH2.0 glycine-hydrochloric acid buffer and stir to dissolve, then add 0.08ml of TritonX-100 and 30ml of ethylene glycol, stir to dissolve Afterwards, dilute to 1000ml with 150mmol / L pH2.0 glycine-hydrochloric acid buffer solution to obtain 1000ml containing 10g / L diphenylcarbazide, 60g / L phthalic anhydride, 0.08ml / L TritonX-100, 30ml / L Ethylene glycol 150mmol / L pH2.0 glycine-hydrochloric acid buffer is a liquid chromium ion detection reagent;

[0054] Step 2: Take seven 10ml glass colorimetric tubes, set the first colorimetric tube as a blank tube, and the second to seventh colorimetric tubes as standard tubes, add 10ml deionized water and 10ml into the blank tube and standard tube respectively Chromium ion standard solution with a concentration of 0.05mg / L, 0.10mg / L, 0.20mg / L, 0.40mg / L, 0.60mg / L, 0.80mg / L, and then add the liquid chromium ion detection reagent described in step...

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Abstract

The invention discloses an on-site rapid detection method for chromium ions in water capable of eliminating the influence of reagent blanks. The method prepares a liquid-type chromium ion detection reagent, deducts the blank color of the reagent, and manufactures a standard color card with a transparent plastic plate as a supporting material. 1. When testing, superimpose the color of the blank tube on the standard color card and then compare it with the sample tube. It takes time; by superimposing the color of the blank tube on the standard color card and then comparing it with the sample tube, it can effectively eliminate the negative impact of the fluctuation of the reagent blank on the accuracy of the test result, especially suitable for rapid on-site detection of chromium ions in water .

Description

technical field [0001] The invention belongs to the field of water quality detection, and in particular relates to a rapid on-site detection method for chromium ions in water which can eliminate the influence of reagent blanks. Background technique [0002] Chromium is one of the trace elements necessary for living organisms, but a large amount of chromium will pollute the environment and endanger human health. The toxicity of hexavalent chromium is 100 times that of trivalent chromium, and chromium poisoning mainly refers to hexavalent chromium. Drinking water polluted by chromium-containing industrial wastewater can cause nausea, vomiting, diarrhea, abdominal pain and ulcers. Long-term or short-term exposure to or inhalation of hexavalent chromium will cause cancer. In addition, excessive hexavalent chromium will not decompose naturally in the environment, but will accumulate in the environment and human body, causing harm. [0003] Chromium ions in water are mostly dete...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N21/78
Inventor 连国军
Owner WENZHOU MEDICAL UNIV
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