摘要
研究了在氢氧化钠介质中,偶氮氯膦-mA与钙的显色反应条件及共存离子的影响。配合物的λ_(max)为640nm,表观摩尔吸光系数(ε)为9.7×10~3,钙浓度在0～12μg/10ml范围内符合比耳关系。成功地用于小麦粉、猪肝标准物质、食品、矿泉水等钙的测定。方法选择性好、简便、快速。
A study of the color reaction of Ca^(2+) ion with CPA-mA in NaOH medium is reported in this paper. The absorption maxima lies at 640nm, with a molar absorptivity of 9. 7×10~3L ·mol^(-1) ·cm^(-1). Beer's law holds in the concentration range of calcium 0~12μg/10ml. The proposed method is proved to be seletive, rapid and convenient, and has been applied to the determination of calcium in some foodstuffs and drinking water with satisfactory results.
出处
《理化检验（化学分册）》
CAS
CSCD
北大核心
1999年第5期221-222,共2页
Physical Testing and Chemical Analysis(Part B:Chemical Analysis)
关键词
钙
偶氮氯膦-MA
光度法
测定
Calcium, CPA-mA, Photometry, Foodstuffs, Drinking water
