原子吸收光谱法测定小白鼠脑组织中Na,K,Ca

本文利用空气－煤气火焰或空气－乙炔火焰原子吸收光谱法分别测定小白鼠脑组织中Na,K,Ca。样品用HNO3－KClO4体系消化。用LaCl3消除P对Ca的干扰，以CsCl作Na,K的消电离剂。共测定了4组46个不同代表性的样品，测定Na,K,Ca的相对标准偏差（RSD）分别为0.886%,0.691％和0.824%，加标回收率分别为100.6%,102.0%和98.4%。

Determination of Na,K and Ca in Brains of Less White Mouse by AAS

Sodium,potassium and calcium in brain of less white mouse were determined using an atomic absorption spectrometry.The sodium was atomized by air-town-gas flame,and the potassium and calcium were atomized by air-acetylene flame.The brains took from 46 less white mice which came from 4 sets of contrast samples.The brain (0.05-0.1 g) after drying up was digested by a nitric-perchloric acid system.The interference effect of phosphor in the brain on the calcium was overcome by adding in lanthanum chloride.Sodium and potassium in the brain itself were used as deionization agents for determining calcium.Cesium chloride was used as the deionization agent for determining sodium and potassium.The experimental results showed that the RSD (n=6) was 0.886% for sodium,0.691% for potassium and 0.824% for calcium,and the addition standard recovery (ASR) (n=3) was 97.5%-102.4% for sodium,100.3%-104.0% for potassium and 96.0%-103.2% for calcium,respectively.