Formic acid for industrial use (3)

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In an acidic solution of nitric acid, the chloride ions in the sample and silver nitrate generate silver chloride , which is turbidity with the standard turbidity solution

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Visible spectrophotometer with 5cm cuvette

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Weigh 1g laboratory sample, accurate to 0.

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Take different volumes of chloride (CD) standard solutions according to product specifications (see Table 2) into three 50mL colorimetric tubes, add 2mL nitric acid solution to each, and then add water to 25mL as the standard turbidity chloride solution

Table 2 The volume of chloride (CI) standard solution in the standard turbidity solution of products of different specifications

5.

Add 1 mL of silver nitrate solution to each colorimetric tube containing the test solution and the chloride standard turbidity solution , shake it well, and place it in a dark place for 25 minutes.
Perform axial turbidity with the chloride standard turbidity solution corresponding to the corresponding specifications , To determine the level of the indicator
.

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7.
4.
4 Spectrophotometry (Arbitration Law)

Add 1 mL of silver nitrate solution to each colorimetric tube containing the test solution and the chloride standard turbidity solution , shake it well, and place it in a dark place for 25 minutes, with water as a blank, and measure the absorbance at a wavelength of 420 nm
.
Compare the absorbance value of the test solution with the absorbance value of the chloride standard turbidity solution corresponding to the corresponding specification to determine the level of this index
.