Development of an SPME/ATR-IR chemical sensor for detection of phenol type compounds in aqueous solutions.
Development of an SPME/ATR-IR chemical sensor for detection of phenol type compounds in aqueous solutions.
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DOI：
10.1039/b008569n
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发表时间：
2001
期刊：
影响因子：
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通讯作者：
J. Yang;M. Cheng
中科院分区：
文献类型：
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作者：
J. Yang;M. Cheng
建立了固相微萃取(SPME)与衰减全反射红外光谱(ATR-IR)联用测定水溶液中苯酚的新方法。研究了几种类型的酚，包括附着在甲基、羟基、氯和硝基上的酚，这些酚对环境有害。由于苯酚类化合物的极性，考察了六种聚合物的吸酚性能。结果表明，在所考察的聚合物中，聚丙烯腈-丁二烯共聚物是最合适的固相微萃取相。为了进一步提高苯酚检测的灵敏度，对pH效应、盐效应和固相微萃取相厚度等因素进行了考察。结果表明，pH值对分析物的中性形式百分比有很大影响，因此对检测信号也有影响。由于苯酚的酸性，在低pH值的溶液中苯酚的检测效果最好。在溶液中加入盐后，观察到信号增加了两到三倍。标准曲线线性检验结果表明，四种酚类的回归系数(R2)均大于0.996。大多数化合物对苯酚的检出限均低于200微克L-1。
A new method, based on a combination of solid phase micro-extraction (SPME) and attenuated total reflection infrared (ATR-IR) spectroscopy, was developed for the detection of phenols in aqueous solutions. Several types of phenols were studied including phenols attached to methyl, hydroxyl, chlorine and nitro groups, which are environmentally toxic. Because of the polarity of the phenol-type compounds, the performance of six polymers in attracting phenols was investigated. Results indicated that poly(acrylonitrile-co-butadiene) was the most suitable SPME phase among the investigated polymers. To further increase the sensitivity in phenol detection, factors, such as the pH effect, salt effect and thickness of the SPME phase, were investigated. Results indicated that pH values affected the neutral form percentage of the analytes strongly and, hence, affected the detected signals. Due to the acid nature of phenols, phenol detection occurs best in solutions with a low pH value. A two- to three-fold increase in signals was observed after the addition of salt into the solution. The results on the examination of standard curve linearity indicated that the regression coefficients (R2) were higher than 0.996 for four types of phenols. The obtained detection limits for phenols were lower than 200 micrograms L-1 for most of the compounds.