Detection kit for on-site quick detection of chromium ions in water and preparing method

A technology for detecting reagents and chromium ions, which 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 time and adverse effects on the accuracy of detection results, etc. , to achieve the effect of high accuracy, easy operation and simple method

Inactive Publication Date: 2016-10-05
WENZHOU MEDICAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Since the temperature of water samples collected in different seasons and different regions is not the same, the time required for dissolving dry powder detection reagents is also different. It is difficult to effectively control the time required for the entire detection process, which also adversely affects the accuracy of the detection results.

Method used

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  • Detection kit for on-site quick detection of chromium ions in water and preparing method
  • Detection kit for on-site quick detection of chromium ions in water and preparing method
  • Detection kit for on-site quick detection of chromium ions in water and preparing method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] An on-site rapid detection kit for chromium ions in water, the kit is composed of the following materials:

[0023] Liquid chromium ion detection reagent 1 bottle (10ml)

[0024] Chromium ion standard color card 1 piece

[0025] The preparation method of this kit is realized through the following steps:

[0026] 1. Preparation method of liquid chromium ion detection reagent:

[0027] (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;

[0028] (2), add 0.05ml TritonX-100, 20ml ethylene glycol, stir to dissolve;

[0029] (3) Dilute to 1000ml with 150mmol / L pH2.0 glycine-hydrochloric acid buffer.

[0030] 2. Preparation method of chromium ion standard color card:

[0031] (1), accurately weigh 0.1410g potassium dichromate and dissolve it with deionized water and settle to 500mL to obtain a concentration of chromium ion stock solution of 100mg / L, then use deionized water ...

Embodiment 2

[0037] In order to further prove the inventiveness of the present invention, the present invention has done following comparative experiment, investigates the impact of the change of reagent blank on the accuracy of measurement result. The on-site rapid detection kit for chromium ions in water described in Example 1 of this law is the test group, and the detection kit that does not deduct the reagent blank and uses the standard color card for direct colorimetry is the control group, and the detection reagents of the two groups of kits are Store in a 4°C refrigerator and a 37°C water bath for 7 days, and measure the same water sample whose chromium ion concentration is 0.20mg / L by atomic absorption method. 721 spectrophotometer records the blank value of the reagent. During the test, the optical path of the cuvette is 1 cm, the test wavelength is 545 nm, and the reference solution is deionized water. The results are shown in Table 2.

[0038] Table 2

[0039]

[0040] As ca...

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Abstract

The invention discloses a detection kit which is used for on-site quick detection of chromium ions in water and capable of eliminating reagent blank influences and a preparing method of the kit. In a faintly acid medium, hexavalent chromium in water reacts with diphenylcarbazide to generate a purple red complex, and the shade of the purple red complex is in direct proportion to the concentration of chromium ions; a comparison with a test tube is made after the color of a chromium ion standard color chart with reagent blank eliminated and a blank tube color are overlaid, and the concentration of chromium ions in a water sample to be tested is obtained. The detection kit is especially suitable for on-site quick detection of chromium ions in water.

Description

technical field [0001] The invention relates to the field of water quality detection, in particular to an on-site rapid detection kit for chromium ions in water and a preparation method. 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 detected by visible light spectrophotometry, ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N21/78
Inventor 杨剑方陈旻诗邵洁菲连国军
Owner WENZHOU MEDICAL UNIV
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