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An economical and rapid type test pack for colorimetric determination of a concentration of hexavalent chromium in water and a determination method

A technology for colorimetric determination and hexavalent chromium, which is applied in the direction of material analysis by observing the influence of chemical indicators, and analysis by making materials undergo chemical reactions, which can solve the problems of cumbersome operation and expensive hexavalent chromium concentration , to achieve the effect of simple detection steps, improved detection efficiency and stability, and high accuracy

Inactive Publication Date: 2015-07-22
SHENZHEN ACAD OF ENVIRONMENTAL SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The present invention overcomes the problems of expensive and cumbersome operations in detecting the concentration of hexavalent chromium in water in the prior art, and provides an economical and fast colorimetric test kit and method for measuring the concentration of hexavalent chromium in water

Method used

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  • An economical and rapid type test pack for colorimetric determination of a concentration of hexavalent chromium in water and a determination method

Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0094] (1) Preparation of standard color comparison card: use glossy coated paper to print standard color comparison card, concentration-color number-color formula is as follows:

[0095] 0 mg / L~0.005 mg / L—colorless and transparent,

[0096] 0.01 mg / L~0.025 mg / L—weak lavender,

[0097] 0.04 mg / L~0.06 mg / L—

[0098] 0.07 mg / L—

[0099] 0.09 mg / L~0.1 mg / L—PANTONE 2563 C—[PANTONE Rub. Red 6.30, PANTONE Violet 6.30 and PANTONE Trans. Wt. 87.40],

[0100] 0.2 mg / L—PANTONE 2573 C—[PANTONE Rub. Red 12.50, PANTONE Violet 12.50 and PANTONE Trans. Wt. 75.00],

[0101] 0.3 mg / L—[PANTONE 2573 C, PANTONE 2583 C]—[PANTONE Rub. Red 12.50, PANTONE Violet 12.50, and PANTONE Trans. Wt. 75.00]→[PANTONE Rub. Red 25.00, PANTONE Violet 25.00, and PANTONE Trans. Wt. 50.00],

[0102] 0.4 mg / L—PANTONE 2582 C—[PANTONE Purple 40.60, PANTONE Vio...

Embodiment 1

[0120] (1) Sample pretreatment: Two 100 mL reservoir samples were collected in two acid-washed 100 mL glass bottles, one of which was adjusted to pH 5 with 8 mol / L nitric acid, and part of it was prepared as 50 mL of 0.002 mg / L hexavalent chromium spiked sample, coded as a; another sample is taken directly to prepare 50 mL of 0.002 mg / L hexavalent chromium spiked sample, with 8 mol / L nitric acid adjusts the pH of the solution to 5, numbered as b;

[0121] (2) Color reaction: Take two 25 mL colorimetric bottles, add two samples a and b to the 10 mL mark respectively, add a pack of hexavalent chromium powder reagent respectively, cover the bottle caps, and shake several times to make them It was completely dissolved and left to react for 5 minutes;

[0122] (3) Colorimetric determination: at 6 minutes, compare the color of the sample to be tested with the standard color card.

[0123] In this example, the colors of samples a and b are colorless and transparent, consistent wit...

Embodiment 2

[0125] (1) Sample pretreatment: Two 100 mL river water samples were collected in two acid-washed 100 mL glass bottles, one of which was adjusted to pH 4.5 with 8 mol / L nitric acid, and part of it was prepared as 50 mL of 0.1 mg / L hexavalent chromium spiked sample, coded as c; directly take part of another sample to make 50 mL of 0.1 mg / L hexavalent chromium spiked sample, with 8 mol / L L nitric acid adjusts the pH of the solution to 4.5, numbered as d;

[0126] (2) Color reaction: Take two 25 mL colorimetric bottles, add two samples c and d to the 10 mL mark, respectively add a pack of hexavalent chromium powder reagent, cover the bottle caps, and shake several times for It was completely dissolved and left to react for 5 minutes;

[0127] (3) Colorimetric determination: at 6 minutes, compare the color of the sample to be tested with the standard color card.

[0128] In this example, the colors of c and d samples are all displayed as PANTONE 2563 C, which is consistent with t...

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Abstract

An economical and rapid type test pack for colorimetric determination of a concentration of hexavalent chromium in water in a water body and a determination method are provided. The test pack and the method are characterized in that: an integrated agent kit and a set of standard colorimetric cards are adopted to establish the rapid and convenient method, determination of a sample is achieved by following three simple steps, namely a step of adjusting pH of the sample by pretreatment, a step of performing a chromogenic reaction, and a step of comparing with the prefabricated standard colorimetric cards, and a determination range is 0-0.6 mg / L. Only one time of agent addition is performed in the whole process. Operation is simple. Agents are common and easily available. The test pack and the method are capable of rapidly obtaining a determination result, free of use of any measurement instrument and low in determination cost, provide a novel manner for determination of the hexavalent chromium in water, and have important significance for meeting people and market demands and ensuring drinking water safety.

Description

technical field [0001] The invention relates to the field of measuring the concentration of hexavalent chromium in water quality, in particular to an economical and rapid colorimetric test kit and a measuring method for determining the concentration of hexavalent chromium in water quality. Background technique [0002] Hexavalent chromium is one of the important indicators of water pollution. Hexavalent chromium is mainly a chronic poison to humans. It can invade the human body through the digestive tract, respiratory tract, skin and mucous membranes, and accumulate in the liver, kidney and endocrine glands in the body. Enters through the respiratory tract and tends to accumulate in the lungs. Hexavalent chromium has a strong oxidizing effect, and chronic poisoning often begins with local damage and gradually develops into serious diseases, and even causes cancer. Chromium pollution sources are mainly chromium-containing ore processing, metal surface treatment, leather tan...

Claims

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Application Information

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IPC IPC(8): G01N21/78
Inventor 尹魁浩廖汝娥宋战锋刘邦楠彭盛华
Owner SHENZHEN ACAD OF ENVIRONMENTAL SCI
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