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An economical and rapid type test pack for colorimetric determination of sulfides in a water body and a determination method

A colorimetric determination and sulfide technology, which is applied in material analysis by observing the influence of chemical indicators, and analysis by chemical reaction of materials, etc. Expensive and other problems, to achieve broad market prospects and social benefits, simple operation process, wide detection concentration range

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

[0003] The present invention overcomes the problems of high price and cumbersome operation in the determination of sulfide in water in the prior art, which cannot be popularized by the general public, and provides an economical and fast colorimetric test kit and determination for sulfide in water method

Method used

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  • An economical and rapid type test pack for colorimetric determination of sulfides in a water body and a determination method

Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0125] Step 1. Preparation of standard color comparison card: use glossy coated paper to print standard color comparison card,

[0126] The sulfide kit can also use sulfide reagent I prepared from p-aminodimethylaniline and sulfuric acid (American Hach Company, product number: 1816-32) and sulfide reagent II prepared from potassium dichromate solution (American Hach Company , Item No.: 1817-32). At this time, the color parameters of each concentration point of the standard color comparison card need to be calibrated through the ink formula guide of the American PANTONE international standard color card (model: GP 1401) to avoid problems caused by the purity of the reagent, weighing deviation and the existence of special interference substances. Chromatic aberration, follow-up standard detection procedures should also use this self-made reagent.

[0127] Standard testing procedure:

[0128] Pre-color reaction: Take a 25 mL colorimetric bottle and add water sample to the 25 ...

Embodiment 1

[0136] (1) Sample preparation: A 500 mL reservoir sample was collected in an acid-washed 500 mL glass bottle, and part of it was prepared into a 50 mL 0.01 mg / L sulfide spiked sample, coded as A.

[0137] (2) Pre-color reaction: Take a 25 mL colorimetric bottle and add water sample A to the 25 mL mark, add 1.0 mL of pre-color reaction reagent, shake to make it fully mixed.

[0138] (3) Color reaction: Add 1.0 mL of color reaction reagent, shake to mix well, and let the reaction stand for 5 minutes.

[0139] (4) Colorimetric determination: compare the color of the sample to be tested with the standard color card within 3 to 5 minutes.

[0140] The color of sample A in this example is shown to be between colorless and transparent and PANTONE 7541 C, which is consistent with the color of the standard color card 0.01 mg / L, and the results are reproduced.

Embodiment 2

[0142] (1) Sample preparation: A 500 mL reservoir sample was collected in an acid-washed 500 mL glass bottle, and part of it was prepared into a 50 mL 0.075 mg / L sulfide spiked sample, numbered B.

[0143] (2) Pre-color reaction: Take a 25 mL colorimetric bottle and add water sample B to the 25 mL mark, add 1.0 mL of pre-color reaction reagent, shake to make it fully mixed.

[0144] (3) Color reaction: Add 1.0 mL of color reaction reagent, shake to mix well, and let the reaction stand for 5 minutes.

[0145] (4) Colorimetric determination: compare the color of the sample to be tested with the standard color card within 3 to 5 minutes.

[0146] The color of sample B in this example is displayed as PANTONE 7457 C, which is consistent with the color of the standard color card 0.075mg / L, and the results are reproduced.

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Abstract

An economical and rapid type test pack for colorimetric determination of sulfides 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 convenient method, determination of a sample is achieved by following three simple steps, namely a step of performing a pre-chromogenic reaction, a step of performing a chromogenic reaction, and a step of comparing with the prefabricated standard colorimetric cards, and a determination range is 0-0.70 mg / L. Only two agents are added in the whole operation process. Operation is simple. The agents are cheap 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, can be widely used in society after being developed into products, and further ensure water safety. The test pack and the method fill the gap that only laboratory standard determination methods are provided for water sulfide determination at present while no rapid potable colorimetric determination method is provided.

Description

technical field [0001] The invention relates to an economical and rapid colorimetric test kit for measuring sulfide in water and a measuring method. Background technique [0002] Sulfides in water include dissolved H 2 S, HS - , S 2- , Soluble sulfides, acid-soluble metal sulfides and unionized organic and inorganic sulfides in suspension. Hydrogen sulfide is easy to escape from water to air, which produces odor and is toxic, which can cause hypoxia in human cells and tissues and endanger human life. In addition to being able to corrode metals by itself, hydrogen sulfide can also be oxidized into sulfuric acid by microorganisms in sewage, and then corrode sewers and so on. Therefore, sulfide is an important indicator of water pollution. However, at present, national or industry standard analytical methods are mostly used for the detection of sulfide in water bodies, such as indirect atomic absorption method, iodometric method, spectrophotometric method, etc. The detecti...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N21/78
Inventor 尹魁浩周廷尧宋战锋刘邦楠彭盛华
Owner SHENZHEN ACAD OF ENVIRONMENTAL SCI
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