超声波萃取-红外分光光度法测定土壤中石油类

采用超声波萃取-红外分光光度法测定土壤中石油类,并对超声波机的功率、水浴温度和萃取时间进行优化.试验表明：方法在0mg/L～80.0mg/L范围内线性良好,相关系数r为0.9997;方法检出限为6.00μg/L,当取土壤样品10.0g时,方法检出限为0.03mg/kg;空白土壤的加标回收率为97.4% ～103%;测定实际土壤样品的RSD为3.0% ～3.9%.通过比较超声波萃取、四氯化碳热浸法和快速溶剂萃取法的前处理效果,显示出超声波萃取法的优越性.

Determination the Petroleum Oils in Soil by Ultrasonic Extraction with Infrared Spectrophotometric Method

A method was established to determine petroleum oils in soil by ultrasonic extraction-infrared spectrophotometry. Such conditions were optimized as the ultrasonic power, the water bath temperature and the extraction time. The results showed good linearity in the range of 0 mg/L - 80.0 mg/L,with the correlation coefficient 0. 999 7 ;The method detection limit come to be 0.03 mg/kg when the sample number was 10.0 g. The spiked recoveries of blank soil were 97.4% - 103% ; The RSDs of determination of the actual soil samples ranged from 3.0% to 3.9%. Compared to hot dipping method and accelerate solvent extraction, the ultrasonic extraction showed its superiority.