微波消解-FAAS测定广州海域沉积物中的铜和铬

Determination of Cu and Cr in coastal sediment of guangzhou by FAAS with microwave digestion

针对传统湿法消解海洋沉积物耗时久、劳动强度大及产生有害气体等问题,采用微波消解作为测定沉积物中铜和铬的样品前处理方法。通过火焰原子吸收光谱法测定广州海域沉积物中铜和铬含量,比较测定结果与标准值的差异。实验结果表明,HNO3和HNO3+HClO4两种消解体系消解测定无明显差异,Cu和Cr的检出限分别为0.43×10-6和1.49×10-6,精密度和准确度可靠,该方法具有速度快、试剂用量少、样品不易被玷污等优点。

The traditional wet marine sediment digestion is time-consuming, laborious and bringing harmful gases. In determination of Cu and Cr in coastal sediment of Guangzhou, the pretreatment method was the microwave digestion, and Cu and Cr were tested by FAAS. The difference of analytical results and reference value was studied. The results show that there is no evident difference when the sample is degested with HNO3 or HNO3＋ HClO4, the detection limit of Cu and Cr are 0.43×10^-6 and 1.49×10^-6 respectively, and the precision and accuracy are reliable. Besides, this method is also considered with the advantages of rapid, reagent-saving and sample-protecting.