Detection method of soluble heavy metals contained in dye

A detection method and soluble technology, applied in the direction of color/spectral characteristic measurement, test sample preparation, etc., can solve the problems of no drying time, difficult operation, no specified temperature value, etc., and achieve simple and easy operation effect

Inactive Publication Date: 2011-05-18
上海展辰涂料有限公司
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  • Abstract
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Problems solved by technology

[0003] However, this method is not ideal for the sample pretreatment of liquid paint, because there is no

Method used

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  • Detection method of soluble heavy metals contained in dye
  • Detection method of soluble heavy metals contained in dye

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[0020] Example

[0021] A method for detecting soluble heavy metals contained in dyes is characterized in that it comprises the following steps:

[0022] (1) Weigh 0.3~0.5g dye sample (accurate to 1mg) and put it into a 150-200ml beaker;

[0023] (2) Add 25ml of 0.07mol / L hydrochloric acid and mix and measure the acid value, if pH>1.5, gradually add dropwise a 2mol / L hydrochloric acid solution and shake it up to make the pH between 1.0-1.5;

[0024] (3) Then wrap the protective film on the mouth of the beaker and put it in a constant temperature shaking water tank, continuously shake the mixed solution at 37±2℃ for 0.5 to 1 hour, and then stand for 0.5 to 1 hour;

[0025] (4) Then immediately filter with qualitative filter paper and store in the dark. The test should be completed within 4h; if the test cannot be completed within 4h, 25ml of 1mol / L hydrochloric acid solution should be added to process the sample.

[0026] Remarks:

[0027] (1) After 0.07mol / L hydrochloric acid is prepared,...

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Abstract

The invention discloses a detection method of soluble heavy metals contained in dye, which is characterized by comprising the following steps of: 1, weighting a dye sample, and placing in a glass container; 2, adding 0.07mol/L hydrochloric acid, mixing and then measuring acid value of the hydrochloric acid, regulating the pH value to be between 1.0 and 1.5; 3, winding a protective film on the glass container and placing in a constant temperature oscillating water tank, oscillating a mixed solution for 0.5-1h at a constant temperature of 37+/-2 DEG C, standing for 0.5-1h; and 4, immediately filtering with qualitative filter paper, keeping filtrate in a dark place for more than 4h, adding 1mol/L hydrochloric acid solution in the filtrate, and then testing by adopting an atomic absorption spectrophotometer. The method is simple and easy to operate; the raw materials in coating can be subjected to the control of soluble heavy metals; and the effect of indirectly controlling the soluble heavy metals in the coating can be achieved.

Description

technical field [0001] The invention belongs to the field of architectural coatings, in particular to a method for detecting soluble heavy metals contained in dyes used in coatings. Background technique [0002] Dyes are widely used in architectural coatings. Most of the sample pretreatment methods for the detection of soluble heavy metals contained in dyes currently refer to the film-making method in Appendix D of GB18582-2008, including the following steps: (1) Film preparation: Stir the sample After uniformity, prepare a coating film on a glass plate (soaked in 1:1 nitric acid aqueous solution for 24 hours, then wash and dry) according to the requirements of the coating product, and take a sample after it is completely dry (if it is dried, the temperature should not exceed 60~C ), crush it at room temperature, and sieve through a 0.5mm metal sieve to be processed. (2) Sample treatment: Weigh 0.5g (accurate to 0.0001g) of the crushed and sieved sample, add 25mL of 0.07mol...

Claims

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Application Information

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IPC IPC(8): G01N21/31G01N1/38
Inventor 庞德红肖华平李婷
Owner 上海展辰涂料有限公司
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