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中文摘要：
本文用溴化十六烷基三甲胺（HDTMAB）改性的天然斜发沸石微填充柱，建立了顺序注射在线分离富集电热原子吸收法测定水中Cr（Ⅵ）及铬形态分布的方法。方法测定Cr（Ⅵ）的线性范围为0．1～3．0μg／L，检出限为0．03μg／L，精密度为3．7％（1．0μg／L，n=5），采样频率为16／h，当进样体积为200μL时的富集倍率为5．6。用本法测定了标准水样GBW08608中的铬，所得结果与标准值相符。另外测定了自来水中的铬及其形态分布，加标回收率合格。
英文摘要：
A sequential injection procedure for chromium speciation coupled to electrothermal atomic absorption spectrometry was developed by using a micro-column packed with clinoptilolite zeolite modified with hexadecyltrimethylammonium bromide （HDTMAB）. A linear range of 0.1-3.0μg/L for chromium （Ⅵ） was obtained along with a limit of detection of 0.03μg/L. The precision was derived to be 3.7% （n=5） at 1.0 μg/L Cr（Ⅵ）, and an enrichment factor of 5.6 was achieved with a sampling frequency of 16/h. The procedure was applied for the speciation of chromium in a certified reference material of water GBW08608, and the obtained result agreed well with the certified value. Recovery test was performed for a tap water sample, and the results were satisfactory.
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