Puig D, Barceló D
Department of Environmental Chemistry, CID-CSIC, Barcelona, Spain.
J Chromatogr A. 1997 Aug 22;778(1-2):313-9. doi: 10.1016/s0021-9673(97)00302-6.
A high-sensitivity method for the determination of polar phenolic compounds in water samples was developed. Water samples were preconcentrated using on-line solid-phase extraction with LiChrolut EN sorbent and afterwards were analyzed by liquid chromatography and dual coulimetric detection. The first electrode was set at low potential (250 mV) for sample clean up whereas the second one was used for analytical purposes. The system could not be used in its reductive form due to the lack of reversibility on the electrochemical behaviour of nitrophenols. Detection limits at part per trillion level were obtained using only 5 ml of water. Additionally, the large cell constant of the coulimetric detector lead to low values of coefficients of variation (+/- 6) when working with river water.
开发了一种用于测定水样中极性酚类化合物的高灵敏度方法。水样采用LiChrolut EN吸附剂在线固相萃取进行预富集，然后通过液相色谱和双库仑检测进行分析。第一个电极设置在低电位（250 mV）用于样品净化，而第二个电极用于分析目的。由于硝基酚的电化学行为缺乏可逆性，该系统不能以还原形式使用。仅使用5毫升水即可获得万亿分之一水平的检测限。此外，库仑检测器的大池常数导致在分析河水时变异系数值较低（±6）。
