SN/T 1399-2004Limits and inspection of mercury content of button batteries for import and export (English PDF)

4.1 Sampling

4.1.1 The product submitted for inspection should be packaged in its entirety.

4.1.2 Randomly sample 10 samples in the batch.

4.2 Testing requirements

4.2.1 In any of the following cases, mercury content testing should be carried out.

a) the first batch of import and export or import and export for more than one year without import and export;

b) when the materials, processes and production plants of the products are subject to change;

c) when the contract or letter of credit requires the issuance of a mercury content test certificate;

d) Other regulations should be carried out when mercury content is tested.

4.3 Detection method

4.3.1 Principle

The button battery is decomposed with nitric acid and hydrochloric acid, filtered, and part of the filtrate is separated into a mercury vapor generator, and stannous chloride is added to reduce the mercury ions.

For metal mercury, vapor is drawn into the mercury detector (or atomic absorption spectrophotometer) absorption tube, and the mercury atom has a special wavelength for the 253.7 nm mercury resonance line.

The absorption is collected, thereby measuring the absorbance.

4.3.2 Reactive

Hg2++Sn ->2+ Hg+Sn4+

4.3.3 Reagents

Unless otherwise stated, only analytically pure reagents were used in the analysis. The experimental water was either distilled or deionized water or equivalent.

Water.

4.3.3.1 Hydrochloric acid (rho 1.19 g/mL).

4.3.3.2 Hydrochloric acid (1+1).