Значение и использование

5.1 This acid extraction method is designed to indicate the solubility of metals in weak acid media in art materials. This test method can be used as an indicator of the amount of metal readily absorbed. It is not meant to replace in vivo testing of metal absorption. 6 Other relevant information, if available, should be included in the overall toxicological assessment of metal-containing art materials, such as physicochemical properties, toxokinetics (поглощение, distribution, metabolism, and excretion), and the toxic mechanisms (с) of metals, for interest.

5.2 Maximum metal extraction levels can be seen using this test method when the result is 250 ppm or lower. If the result is greater than 250 ppm, the extractant volume should be increased to 100 мл. 7

Шаг 1: Объем

1.1 This test method includes the extraction of metals from art materials using extractants that mimic the acid potential of gastric juices. This test method is similar to the extraction method in specification F963, except that it requires the extraction step to be performed at body temperature rather than at room temperature. The extraction procedure specified in this test method is more stringent than that mentioned in the specification F963, as the procedure results in the extraction of a larger amount of the metal.

1.2 This test method is adapted from the European Toy Safety Standard EN 71-3:1994, but differs in that no solvent extraction step is required to treat wax or oil-based products, and no specific acceptable metal content is specified.

1.3 Appendix X1 discusses the reasonableness of this test method.

1.4 The test method shall be applied to the art material as a whole and not to the art material components. Testing of entire art materials is expected to provide a more accurate estimate of soluble metals than extrapolation of test components.

1.5 Значения, выраженные в единицах СИ, следует рассматривать как стандартные значения.. Никакие другие единицы измерения не включены в настоящий стандарт..

1.6 Настоящий стандарт не предназначен для решения всех проблем безопасности. (если таковые имеются) связанный с его использованием. Пользователи настоящего стандарта обязаны установить соответствующие правила техники безопасности и охраны труда, а также определить применимость нормативных ограничений перед использованием..