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首页> 外文期刊>Analytical chemistry >ION CHROMATOGRAPHY PHOTODIODE ARRAY UV-VISIBLE DETECTION OF CR(III) HYDROLYTIC POLYMERIZATION PRODUCTS IN PURE AND NATURAL WATERS
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ION CHROMATOGRAPHY PHOTODIODE ARRAY UV-VISIBLE DETECTION OF CR(III) HYDROLYTIC POLYMERIZATION PRODUCTS IN PURE AND NATURAL WATERS

机译：离子色谱法光电二极管阵列在纯水中和天然水中的UV（可见）检测CR（III）水解聚合产物

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摘要

Hydrolytic polymerization of Cr(III) aqua ions was investigated in pure Milli-Q water and in surface waters, using Sephadex column fractionation followed by nonsuppressed ion chromatography (IC) with UV detection at lambda 462 nm. Pure and natural waters spiked with 0.04 M Cr(III) were fractionated on Sephadex columns into four fractions using eluents with increasing ionic strength, Fractions were analyzed for total Cr by atomic absorption, and recoveries ranged from 94 to 101%. Fractions representing monomeric and low oligomeric Cr (III) species were subjected to IC using a low-capacity mixed resin column and a mobile phase consisting of 2 M NaClO4/0.02 M HClO4 at pH 4.50. Monomeric Cr(III) species were detected in the IC chromatograms of the freshly prepared Cr(III) solution with capacity factors (k') ranging from 0.05 to 0.40, In the 3-days-aged samples, dimeric and trimeric peaks with k' = 1.09 and 1.70, respectively, were detected, Monomeric, dimeric and trimeric Cr(III) peaks collected from the IC preparative experiments were scanned between lambda 200 and 600 nm, using a photodiode array detector. The UV-visible spectral characteristics of the monomer, dimer, and trimer confirmed their identities. The trimeric Cr(III) peak was more predominant in the IC chromatograms of the surface water and accounted for 6.5-35.9% of the total Cr(III) in the samples.
机译：使用Sephadex色谱柱分馏，然后进行非抑制离子色谱（IC）和λ波长462 nm的UV检测，研究了纯Milli-Q水和地表水中Cr（III）离子的水解聚合。使用增加离子强度的洗脱液，在Sephadex色谱柱上将掺有0.04 M Cr（III）的纯净水和天然水分为四个馏分，并通过原子吸收分析馏分中的总Cr，回收率在94％到101％之间。使用低容量混合树脂色谱柱和流动相（由pH值为4.50的2 M NaClO4 / 0.02 M HClO4组成）对代表单体和低聚Cr（III）物种的馏分进行IC分析。在新制备的Cr（III）溶液的IC色谱图中检测到单体Cr（III）种类，容量系数（k'）为0.05至0.40，在3天老化的样品中，二聚体和三聚体峰的k'分别检测到1.09和1.70，使用光电二极管阵列检测器在λ200和600 nm之间扫描从IC制备实验收集的单体，二聚和三聚Cr（III）峰。单体，二聚体和三聚体的紫外可见光谱特征证实了它们的身份。三聚体Cr（III）峰在地表水的IC色谱图中更占优势，占样品中总Cr（III）的6.5-35.9％。

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