大孔球形纤维素预富集原子吸收测定痕量铜

将含铜试液调至pH=6．9，在流动注射分析体系中用装有PSC—OCA的微型柱对试液中Cu^2＋进行在线富集，用0．1mol·L^-1硝酸洗脱柱上富集的Cu^2＋火焰原子吸收光谱法在线测定．对实验条件进行了优化．在pH=6．9时，吸附预富集时间为90s，富集流速为2．5ml·min^-1的条件下，然后用流速为2ml·min^-1的0．1mol·L^-1的硝酸洗脱，直接送入FAAS进行检测，对5μg·L^-1的Cu^2＋标准溶液4次平行测定，精密度（RSD）为0．25％，这说明大孔纤维素能对Cu^2＋有效富集，能够用于检测低浓度Cu^2＋，效果令人满意．

Spherical Celiulose Preenrichment for Determination of Cu by Flame Atomic Absorption Spectrometry

The pH of the sample was adjusted to 6.9 , the Cu^2 ＋ in the sample.was then precoucentrated online with flow injection system on column packed with Porous spherical cellulose , eluted 0.1 mol/L - 1 nitric acid. measured with flame AAS online . At pH 6.9, the reaction time for preeoncentration was 90 s at flow rate of 2.5mL/min, then eluted at 2.0 mL/min with 0.1 mol/L nitric acid for FAAS determination. The precision for four replicate determinations of 5 μg/L - 1 Cu^2 ＋ standard solution was 0.25% （RSD）. The concentration of the Cu^2 ＋ in the sample was enriched for 28 times with the process.