Improved measurement method for chromic acid mist in stationary source emission
A technology of fixed pollution source and measurement method, applied in the field of improved determination of chromic acid mist in exhaust gas of fixed pollution source, can solve problems such as low sensitivity, and achieve the effects of high sensitivity, wide application range and simple steps
Inactive Publication Date: 2015-06-03
ZHEJIANG ZHENGAN DETECTION TECH CO LTD
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Problems solved by technology
[0005] In order to overcome the deficiencies of the background technology, the present invention provides an improved method for measuring chromic acid mist in exhaust gas from fixed pollution sources, which mainly solves the problem of low sensitivity of the existing method for measuring chromic acid mist in exhaust gas from fixed pollution sources. The method for the determination of chromic acid mist in the exhaust of pollution sources has the advantages of wide application range, simple steps, high sensitivity and good reproducibility.
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[0013] Embodiments of the present invention will be further described below in conjunction with accompanying drawings:
[0014] like figure 1 As shown, an improved method for measuring chromic acid mist in the exhaust of fixed pollution sources comprises the following steps:
[0015] (1) Preparation of sulfuric acid solution: 1+9
[0016] Measure 100ml of ρ=1.84g / ml sulfuric acid with a graduated cylinder, slowly (while stirring) pour it into about 500ml of water, transfer it to a 1000ml volumetric flask, and dilute with water to the marked line;
[0017] (2) Preparation of diphenylcarbohydrazide solution
[0018] Weigh 2.5g of diphenylcarbohydrazide, dissolve it in 40ml of 95% ethanol, add 80ml of 1+9 sulfuric acid solution, shake well, and store in the refrigerator. This reagent should be colorless, and it should not be used if its color changes;
[0019] (3) Hexavalent chromium standard stock solution: c(Cr 6+ ) = 0.100mg / ml
[0020] Weigh 0.2829g of the reference reag...
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The invention relates to an improved measurement method for chromic acid mist in stationary source emission. The problem of low sensitivity of the conventional measurement method for chromic acid mist in stationary source emission is mainly solved. The method is characterized by comprising the following steps: preparing a 0.10 [mu]g / ml hexavalent chromium standard solution; adding 0, 1.00, 2.00, 4.00, 6.00, 8.00 and 10.00 milliliters of the 0.10 [mu]g / ml hexavalent chromium standard solution into seven 25 ml color-comparison tubes respectively, adding water to dilute the hexavalent chromium standard solution to 10.00 milliliters, drawing a standard curve, and calculating a linear regression equation; measuring the absorbance A and A1 of a sample and filter cartridge blank; calculating the concentration c(mg / m<3>) of the chromic acid mist in the sample. The improved measurement method for the chromic acid mist in the stationary source emission has the advantages of wide application range, simple steps, high sensitivity, high reproducibility and the like.
Description
technical field [0001] The invention relates to a method for measuring chromic acid mist, in particular to an improved method for measuring chromic acid mist in exhaust gas from fixed pollution sources. Background technique [0002] Chromic acid mist: refers to chromic acid or soluble chromate that exists in the form of aerosol, which is often found in the air around the electroaqueduct for electrophoresis. When the mass concentration in the air reaches 0.1mg / m 3 , Long-term exposure can cause nasal septum perforation; if the concentration of chromic acid mist is too high, nasal septal perforation can occur after several months of exposure. In addition, it can also cause pharyngitis, pneumonia and allergic asthma. In special operations such as electroplating and casting, the hazards of chromic acid mist pollution to employees and the pollution to the surrounding environment have attracted people's attention. [0003] The monitoring of chromic acid mist in the exhaust of f...
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Login to View More IPC IPC(8): G01N21/31
Inventor 余芳
Owner ZHEJIANG ZHENGAN DETECTION TECH CO LTD