報告書番号

282077

タイトル（和文）

底泥中の水銀とヒ素の簡易・迅速分析法

タイトル（英文）

SIMPLE AND RAPID METHODS FOR THE DETERMINATION OF MERCURY AND ARSENIC IN SEDIMENT

概要 （図表や脚注は「報告書全文」に掲載しております）

底泥中の水銀とヒ素を，簡便な操作で迅速に分析する方法を確立した。ＮＢＳの標準底泥試料と日本の４地点の貯水池底泥試料を本研究に用いた。底泥中の水銀を分析するためには，０．５ｇの粉末試料をテフロン容器内蔵ボンブ中で，濃フッ化水素酸１０ｍ■，濃硝酸４ｍ■および濃過塩素酸１ｍ■の混酸により１４０°Ｃで１時間の加熱で分解する。そしてこの分解溶液中の水銀を還元気化冷原子吸光法で定量する。一方，底泥中のヒ素を分析するためには，０．２５ｇの粉末試料をテフロン容器内蔵ボンブ中で，上述した混酸と５％の過マンガン酸カリウム溶液５ｍ■により１４０°Ｃで１時間の加熱で分解する。

概要 （英文）

SIMPLE AND RAPID METHODS HAVE BEEN PROPOSED FOR THE DETERMINATION OF MERCURY AND ARSENIC IN SEDIMENT.A NBS RIVER SEDIMENT(NO.1645)AND 4 SEDIMENTS COLLECTED FROM RESERVOIRS IN JAPAN WERE USED FOR THE STUDY.FOR THE DETERMINATION OF MERCURY IN SEDIMENT,0.5 G OF DRY SEDIMENT WAS DIGESTED FOR 1 H AT 140 DEGREE(C) WITH A MIXTURE OF 10 ML OF HYDROFLUORIC ACID,4ML OF NITRIC ACID AND 1 ML OF PERCHLORIC ACID IN THE TEFLON-LINED BOMB.MERCURY IN THIS SOLUTION WAS MEASURED BY COLD-VAPOR ATOMIC ABSORPTION SPECTROMETRY.FOR THE DETERMINATION OF ARSENIC IN SEDIMENT.0.25G OF DRY SEDIMENT WAS DIGESTED FOR 1 H AT 140 DEGREE(C) WITH A MIXTURE OF THREE ACIDS DESCRIBED ABOVE AND 5 ML OF 5% POTASSIUM PERMANGANATE SOLUTION IN THE TEFLON-BOMB. ARSENIC IN THIS SOLUTION WAS MEASURED BY HYDRIDE GENERATION-ATOMIC ABSORPRION SPECTROMETRY.POTASSIUM PERMANGANATE SOULUTION WAS ADDED TO PREVENT THE SEVERE VOLATILIZATION LOSS OF ARSENIC DURING THE HYDROFLUORIC ACID DIGESTION.THE ANALYTICAL RESULT OF MERCURY OBTAINED BY THE PRESENT METHOD FOR NBS STANDARD SAMPLE AGREED SATISFACTORILY WITH THAT CERTIFIED BY NBS,WHEREAS THE VALUE OF ARSENIC WAS WITHIN THOSE REPORTED BY OTHER AUTHORS(THERE IS NO NBS CERTIFIED VALUE OF ARSENIC.).THE PROPOSED METHOD IS APPLICABLE TO THE ROUTINE DETERMINATION OF MERCURY AND ARSENIC NOT ONLY IN SEDIMENT BUT ALSO IN THE OTHER SAMPLES SUCH AS SOIL AND COAL ASH.

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