非完全消化-火焰原子吸收光谱法测定人发中的钙和镁

Determination of Calcium and Magnesium in Human Hair by Non complete Digestion Flame Atomic Absorption Spectrometry

在 8 0～ 130℃的低温下用浓硝酸及过氧化氢消化人发 ,直到溶液呈透明淡棕色 ,加乳化剂OP溶解消化过程中所产生的油脂 ,可获得一均匀的样品乳浊液。取适量乳浊液 ,加入适量琼脂溶液及释放剂La(Ⅲ )溶液配制成试液。对样品处理条件、干扰的消除及检出限进行了考察。本方法的测定结果与灰化法一致 ,相对误差小于± 0 5 %。方法简便、快速、准确。

Under low temperature of 80-130 ℃ human hair sample is digested by concentrated nitric acid and hydrogen peroxide up to solution present transparent pale brown.The fat and oil produced from digestion of hair sample are solved by emulsifier OP added in the solution,a homogeneous emulsion is gained.Test solutions prepared by adding releasing agent La(Ⅲ) and agar solution in appropriate amount of the emulsion are injected into air acetylene flame and the working curve method is used to determine.Condition of digestion,elimination of interference and the detection limit are studied.Determination results are consistent with those obtained by ashing method.The relative error between them is lees than ±0 5%.This method is convenient,rapid and accurate.