メタル炉原子吸光法による純水中の微量金属の定量 Determination of trace metals in highly purified water by AAS using a metal furnace.

メタル炉原子吸光法による純水中のCa,Fe,Mg,Na及びZnの定量を行った.試料はマイクロフィーダー又はマイクロピペットによってメタル炉上に注入,加熱する方法及びクリーンベンチ内でテフロンビーカーを用いて加熱濃縮した後定量を行い定量値を比較した.定量操作における試料の汚染量の補正は,試料を用いないで同様の定量操作を行いから試験値を求め,定量値から差し引いた.この方法によるから試験値は定量値に比較して極めて小さかった.

Calcium, iron, magnesium, sodium and zinc in highly purified water samples were determined by AAS using a tungsten furnace. Three kinds of preconcentration methods were applied to the samples before AAS measurements. The methods include (1) on-boat concentration with a microfeeder, (2) on-boat concentration with a micropipet, and (3) heating with a Teflon beaker in a clean bench. Samples were corrected for contamination during the preconcentration and measurement procedures by subtracting blank values from measured values. The blank values obtained by performing the same procedures without a sample were negligibly smaller.