樹脂固相萃取在比色分析中的應用研究
中國測試雜志
林 虹， 蔡蘋楊， 謝光明， 胡 萍
（四川省地質工程勘察院環境工程中心，四川 成都 610072）
摘 要：針對可見光區藍（磷鉬藍測硫體系）、黃（磺基水楊酸測鐵體系）、紅（a-萘胺測NO2-體系）3個典型波段，研究樹脂固相萃取有色基團前后的吸光度變化，表明各波段固相比色分別較水相比色最大增長了53.67倍、20.04倍、10.50倍。實驗確定了最佳樹脂用量為3 g，最佳萃取時間30 min。模擬土壤、地質巖石及水質樣品的復雜組合，表明樹脂富集有色基團干擾不嚴重，方法可應用于各類樣品中微量元素的比色分析。
關鍵詞：樹脂；固相萃取；比色分析；應用
中圖分類號：TQ322.4；O652.63；O657.32；O658.1 文獻標志碼：A 文章編號：1674-5124（2013）03-0042-03
Research on application of resin solid phase extraction in colorimetric analysis
LIN Hong， CAI Ping-yang， XIE Guang-ming， HU Ping
（Center of Environmental Engineering，Sichuan Institute of Geological Engineering Investigation，
Chengdu 610072，China）
Abstract: Molybdenum blue measuring sulphur system， sulfosalicylic acid measuring iron system and α-naphthylamine colorimetric measuring nitrite ion system were studied in this paper. The absorbance after resin solid-phase extraction was compared with that before extraction， and the molar extinction coefficient， that is a multiple of the sensitivity， increased respectively 53.67， 20.04， and 10.50 times over the aqueous phase. The optimum amount of resin is 3 g， while the optimum extraction time is 30 min. The mixture system of water samples and soil samples or geological rock samples was simulated， which show that the interference of resin concentration was not great. This method can be applied to various types of colorimetric analysis of micro.
Key words: resin； solid phase extraction； colorimetric analysis； application
