Departament de Química Analítica, Facultat de Química, Universitat de Valencia, C/ Dr. Moliner 50, E46100 Burjassot, Valencia, Spain.
J Hazard Mater. 2013 Dec 15;263 Pt 1:131-8. doi: 10.1016/j.jhazmat.2013.07.037. Epub 2013 Jul 25.
Assessment of seasonal changes in surface water quality is an important aspect for evaluating temporal variation of water due to natural or anthropogenic inputs of point and non-point sources. The objective of this paper was to investigate the influence of seasonal temperature fluctuations and precipitations on the levels of BTEX in natural waters. Principal component analysis (PCA) was used to evaluate the seasonal correlations of BTEX levels in water and to extract the parameters that are most important in assessing seasonal variations of water quality. This study was carried out as a part of VOCs monitoring program in natural water samples from Mediterranean coast. To carry out this project, a multiresidue analytical method was used. The method was based on headspace solid-phase microextraction (HS-SPME) followed by gas chromatography coupled to flame ionization detector (FID). The limits of detection LODs found for the tested analyte tested were in the 0.001-1 μg/L range. These values were adequate for the analysis of these compounds in water samples according to the regulated values. Water samples from different points of the Mediterranean coast were analyzed during a period of three years, and were taken four times per year. Most of the compounds were below the limit established by the legislation. The results obtained by a chemometric study indicated that temperature and precipitations can be related on the BTEX levels found in water. A regression model between temperature or precipitations and BTEX concentration was obtained, thus these models can be used as predictive model for detection any non-normal concentration level.
评估地表水水质的季节性变化是评估由于自然或人为的点源和非点源输入而导致的水质时间变化的重要方面。本文的目的是研究季节性温度波动和降水对天然水中 BTEX 水平的影响。主成分分析（PCA）用于评估水中 BTEX 水平的季节性相关性，并提取评估水质季节性变化最重要的参数。本研究作为地中海沿岸天然水样中 VOCs 监测计划的一部分进行。为了进行这个项目，使用了多残留分析方法。该方法基于顶空固相微萃取（HS-SPME），然后是气相色谱法与火焰离子化检测器（FID）耦合。测试的分析物的检测限（LOD）在 0.001-1μg/L 范围内。这些值足以根据规定值分析水样中的这些化合物。在三年的时间里，对来自地中海沿岸不同地点的水样进行了分析，每年采集四次。大多数化合物低于法规规定的限量。化学计量学研究的结果表明，温度和降水与水中发现的 BTEX 水平有关。获得了温度或降水与 BTEX 浓度之间的回归模型，因此这些模型可用于作为检测任何非正常浓度水平的预测模型。
