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首页> 外文期刊>Acta amazonica >On line pre-concentration for simultaneous determination of low molecular weight organic acids and inorganic anions in Amazonian river water samples employing ion chromatography with conductivity detection
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On line pre-concentration for simultaneous determination of low molecular weight organic acids and inorganic anions in Amazonian river water samples employing ion chromatography with conductivity detection

机译：在线预浓缩，同时使用电导检测的离子色谱法同时测定亚马逊河水样品中的低分子量有机酸和无机阴离子

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An ion chromatography procedure, employing an IonPac AC15 concentrator column was used to investigate on line preconcentration for the simultaneous determination of inorganic anions and organic acids in river water. Twelve organic acids and nine inorganic anions were separated without any interference from other compounds and carry-over problems between samples. The injection loop was replaced by a Dionex AC15 concentrator column. The proposed procedure employed an auto-sampler that injected 1.5 ml of sample into a KOH mobile phase, generated by an Eluent Generator, at 1.5 mL min-1, which carried the sample to the chromatographic columns (one guard column, model AG-15, and one analytical column, model AS15, with 250 x 4mm i.d.). The gradient elution concentrations consisted of a 10.0 mmol l-1 KOH solution from 0 to 6.5 min, gradually increased to 45.0 mmol l-1 KOH at 21 min., and immediatelly returned and maintained at the initial concentrations until 24 min. of total run. The compounds were eluted and transported to an electro-conductivity detection cell that was attached to an electrochemical detector. The advantage of using concentrator column was the capability of performing routine simultaneous determinations for ions from 0.01 to 1.0 mg l-1 organic acids (acetate, propionic acid, formic acid, butyric acid, glycolic acid, pyruvate, tartaric acid, phthalic acid, methanesulfonic acid, valeric acid, maleic acid, oxalic acid, chlorate and citric acid) and 0.01 to 5.0 mg l-1 inorganic anions (fluoride, chloride, nitrite, nitrate, bromide, sulfate and phosphate), without extensive sample pretreatment and with an analysis time of only 24 minutes.
机译：使用IonPac AC15浓缩器柱进行离子色谱分析的方法用于研究在线预浓缩，以同时测定河水中的无机阴离子和有机酸。分离出十二种有机酸和九种无机阴离子，而不会受到其他化合物的干扰以及样品之间的残留问题。注入回路被Dionex AC15浓缩塔取代。拟议的程序采用了自动进样器，将1.5 ml样品以1.5 mL min-1的速度通过Eluent Generator进样到KOH流动相中，该样品被送至色谱柱（一个保护柱，型号AG-15） ，以及一根内径为250 x 4mm的AS15型分析柱）。梯度洗脱浓度由0至6.5分钟的10.0 mmol l-1 KOH溶液组成，在21分钟时逐渐增加至45.0 mmol l-1 KOH，然后立即返回并保持初始浓度直至24分钟。总运行次数。洗脱化合物，并将其运输到与电化学检测器相连的电导检测池。使用浓缩器色谱柱的优点是能够同时进行0.01至1.0 mg l-1有机酸（乙酸根，丙酸，甲酸，丁酸，乙醇酸，丙酮酸，酒石酸，邻苯二甲酸，甲磺酸）中的离子的常规测定酸，戊酸，马来酸，草酸，氯酸和柠檬酸）和0.01至5.0 mg l-1无机阴离子（氟，氯，亚硝酸根，硝酸根，溴离子，硫酸根和磷酸根），无需进行大量样品预处理并进行分析时间只有24分钟。

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