微波消解测定污水中CODcr的比对实验

Comparative experiment of CODcr measure methods by dedicated microware

为研究在COD_(cr)测定中采用家用微波炉替代专用微波消解装置的可行性,采用美的MK823ESJ-PA型微波炉消解与专用WMX-Ⅲ-B微波消解装置消解,硫酸亚铁铵滴定法测定水样中COD_(cr)测定的比对研究,讨论消解功率、消解时间、C1^-干扰等因素对测定的影响,确定最佳的试验条件,当美的MK823ESJ-PA微波炉消解功率为中高火(616 W),消解时间为5 min时,精密度与准确度良好,RSD≤3.72%,加标回收率为94.22%-104.76%,与WMX-Ⅲ-B微波消解装置消解测定结果相对偏差≤3.76%。

This paper explore the possibility of uling commercial microware digestion unit（Midea MK823ESJ-PA）instead of dedicated microwre digestion unit（WMX-Ⅲ-B）in the method for determining CODcr .The best condition to measure CODcr could be determined by testing the methodical frequency ,digestion time,and CI during the trial.It was shown from the test that the microwave digestion was quick（5minutes）,accurate,reliable,RSD≤3.72%under large and middle power conditions,The recovery of the method were 93.4%-118%,and the rilative deviation was unedr 3.76%comparing with using dedecated micrware digestion unit