规定方法的原理是使用火焰原子吸收光谱仪测量钙原子吸收的422,7 nm谱线部分和镁原子吸收的285,2 nm谱线部分，并与参考溶液产生的吸收进行比较。测量钙和镁的浓度，以其氧化物CaO和MgO表示。适用于分析从任何种类的玻璃或玻璃器皿中提取的溶液，包括实验室和制药器皿、食品和饮料包装器皿、餐具和厨房用具。

The principle of the method specified is measuring the portion of the 422,7 nm line absorbed by calcium atoms and of the 285,2 nm line absorbed by magnesium atoms using a flame atomic absorption spectrometer, and comparison with the absorption produced by reference solutions. Measures the concentrations of calcium and magnesium, expressed as their oxides CaO and MgO. Applies to the analysis of extract solutions obtained from any kind of glass or glassware including laboratory and pharmaceutical ware, food and drink packaging ware, tableware and kitchenware.