采用蒸汽蒸馏的矩阵消除法，离子排斥色谱法测定前盐层高盐度水中的短链脂肪酸。

Matrix-elimination with steam distillation for determination of short-chain fatty acids in hypersaline waters from pre-salt layer by ion-exclusion chromatography.

机构信息

Coordenação de Análises Minerais, Centro de Tecnologia Mineral-CETEM, Av. Pedro Calmon 900, Cidade Universitária, CEP 21941-908, Rio de Janeiro, RJ, Brazil.

出版信息

J Chromatogr A. 2012 Feb 3;1223:79-83. doi: 10.1016/j.chroma.2011.12.032. Epub 2011 Dec 14.

DOI:10.1016/j.chroma.2011.12.032

PMID:22226459

Abstract

A method for determination of formic, acetic, propionic and butyric acids in hypersaline waters by ion-exclusion chromatography (IEC), using steam distillation to eliminate matrix-interference, was developed. The steam distillation variables such as type of solution to collect the distillate, distillation time and volume of the 50% v/v H₂SO₄ solution were optimized. The effect of the addition of NaCl different concentrations to the calibration standards on the carboxylic acid recovery was also investigated. Detection limits of 0.2, 0.5, 0.3 and 1.5 mg L⁻¹ were obtained for formic, acetic, propionic and butyric acids, respectively. Produced waters from petroleum reservoirs in the Brazilian pre-salt layer containing about 19% m/v of NaCl were analyzed. Good recoveries (99-108%) were obtained for all acids in spiked produced water samples.

摘要

建立了一种采用离子排斥色谱法（IEC），通过水蒸气蒸馏消除基体干扰，检测高盐水中甲酸、乙酸、丙酸和丁酸的方法。对收集馏出物的溶液类型、蒸馏时间和 50%v/v H₂SO₄溶液体积等水蒸气蒸馏参数进行了优化。还考察了向校准标准中添加不同浓度 NaCl 对羧酸回收率的影响。对于甲酸、乙酸、丙酸和丁酸，检测限分别为 0.2、0.5、0.3 和 1.5mg/L。分析了来自巴西盐下层石油储层的采出水，其中含有约 19%m/v 的 NaCl。在加标采出水样品中，所有酸的回收率均良好（99-108%）。