CAJ | 학술논문

采用流动注射-氢化物发生-气相化学发光法,建立了一种快速简便测定环境样品中微量砷的新方法.土壤样品、地表水样经消解后,加入抗坏血酸和硫脲,将5价砷还原为3价后,以0.6mol/L硫酸为载液,与1.5%硼氢化钠反应,生成的胂化氢由气液分离器分离后.在反应室里与臭氧反应,产生的化学发光信号由光电倍增管检测.该法线性范围宽(1-500 μg/L),检出限为0.15μg/L,相对标准偏差为0.77%(20μg/L,n=11),采样速度为50样/h.应用于环境样品中总砷的测定,结果与氢化物发生原子吸收法一致.
채용류동주사-경화물발생-기상화학발광법,건립료일충쾌속간편측정배경양품중미량신적신방법.토양양품、지표수양경소해후,가입항배혈산화류뇨,장5개신환원위3개후,이0.6mol/L류산위재액,여1.5%붕경화납반응,생성적신화경유기액분리기분리후.재반응실리여취양반응,산생적화학발광신호유광전배증관검측.해법선성범위관(1-500 μg/L),검출한위0.15μg/L,상대표준편차위0.77%(20μg/L,n=11),채양속도위50양/h.응용우배경양품중총신적측정,결과여경화물발생원자흡수법일치.
A simple and fast method for the determination of total arsenic in environmental samples was developed by flow injection-hydride generation gas-phase chemiluminesence.Arsenic was reduced to arsine by sodium borohydride in the media of 0.6 mol/L sulfuric acid.Arsine was separated by a home-made gas-liquid separator and carried to gas-phase reaction chamber,where it was reacted with ozone to generate chemiluminescence.The chemiluminescence was detected by a photomultiplier tube.A good and wide linear relationship (r=0.9996) was obtained in the range of 1-500μg/L of arsenic with a sampling frequency of 50/h.The limit of detection was 0.15μg/L and the relative standard deviation was 0.77% (20μg/L As,n=11).The method has been applied successfully to the analyses of arsenic in environmental samples and the results were in good agreement with those values obtained by hydride generation atomic absorption spectrometry.