環境水中の微量銅(11)のキレート樹脂濃縮における共存有機物の妨害とその紫外線照射分解法(<特集>超微量分析のための前処理と予備濃縮)

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Photochemical decomposition and acid digestion followed by concentration of copper with Chelex 100 chelating resin were studied. Standard 6.13 ppb copper samples containing 4 ppm of humic acid or EDTA adjusted at pH 8 were used for digestion and recovery test. Huminc acid or EDTA in the sample was completely decomposed by UV irradiation for over 20 min at pH 1 and copper was quantitatively recovered. On the other hand, the acid digestion by boiling for 3 h at pH 1 gave 90% and 0% of the recovery of copper from, humic acid solution and EDTA solution, respectively. When the humic acid solution was not treated, the recovery was 14.5%. The recommended procedure was as follows. Sample (400 ml) adjusted at pH 1 with 1 M nitric acid was photo-oxidized by UV irradiation for 30 min. Copper was concentrated on chelatirig resin (Chelex 100) at pH 5 and eluted with 10ml of 1 M nitric acid. Copper in the effluent was determined by spectrophotornetry with tetrakis (4-N-trimethylaminophenyl) porphine. The relative standerd deviation for the standerd sample was 3.65% (n=7). The present method was applied to the determination of copper in the seawater.
社団法人日本分析化学会の論文
1987-11-05