SN/T 4122-2015Food contact material. Paper, regenerated fiber material. Determination of boric acid (English PDF)

SN/T 4122-2015 is the English-translated version of 食品接触材料纸、再生纤维材料 硼酸的测定.

SN/T 4122-2015 — This standard specifies the method for determination of paper, recycled fiber food contact materials boric acid. This standard applies to the paper, measuring fiber food contact materials in the acid regeneration.

The first law-ethyl hexane diol - chloroform extraction colorimetry turmeric Principle 2 by ethylhexyl glycol - chloroform solution of boric acid in the sample for rapid enrichment, extraction, excluding the impact of the coexistence of salts, use Turmeric mixed with concentrated sulfuric acid to generate the protonated acid and turmeric red reaction product.

Color depth and sample solution of Boric Acid into Proportional, boric acid content in the sample can be measured by a colorimetric.

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This preview omits tables, figures, formulas and parts of the technical clauses. The complete document — 6 pages — is available in the English PDF.

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