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日本工作者曾提出一个以GBHA-正戊醇在pH11.7的硼砂缓冲液中边萃取边用EGTA滴定钙的方法。无疑,此法可使灵敏度提高数倍。嗣后又有人将此法应用于超基性岩,但需除硅。笔者发现,上述滴定无需在缓冲液中进行,在强碱性溶液中即可取得一致结果。由于不加硼砂而使空白值显著降低。本法多种阴、阳离子无影响,特别在大量硅酸根离子存在时不干扰,这就给岩、矿中直接测定钙提供有利条件。多数样品一经快速熔矿后无需分离即可直接滴定钙。本法似较需经分离硅(特別是硅酸岩样品)后才能作钙分析的原子吸收法更为简便。
Japanese workers have proposed a method of titrating calcium with EGTA while extracting with GBHA-n-amyl alcohol in a borax buffer of pH 11.7. Undoubtedly, this method can improve the sensitivity several times. Later this law was applied to the ultrabasic rock, but need to remove silicon. The author found that the above titration does not need to be carried out in a buffer solution, and a consistent result can be obtained in a strong alkaline solution. Blank values are significantly reduced due to the absence of borax. This law a variety of anion, cation has no effect, especially in the presence of a large number of silicate ions do not interfere, which gives rock, ore direct determination of calcium to provide favorable conditions. Most samples can be directly titrated without any separation after rapid melting. This method may be more convenient than the atomic absorption method that can be used for calcium analysis after separating silicon (especially silicate samples).