摘要
重铬酸盐法测定化学需氧量受到氯离子的严重干扰,使结果偏高。采用标准曲线扣除法可定量地计算出氯离子的干扰,并在不加氯离子隐蔽剂的情况下测定化学需氧量,从而计算出无氯离子干扰时的化学需氧量。采用该法测定化学需氧量,在国标规定的质量浓度范围50～800mg/L内,其s为2.135～2.388mg/L,CV为4.6%～0.3%,回收率为98.99%。
Because of the existence of chlorine ion, measuring the chemical oxygen consumption by bichromate tends to heighten the testing results. This article illustrates a new method of utilizing standard curve deduction. This method can quantitatively calculate the inaccuracy or errors caused by chlorine ion and measure the chemical oxygen consumption without chlorine ionscreening agent. Measuring the chemical oxygen consumption with this method, the s ranges from 2.135 mg/L to 2.388 mg/L, the CV ranges from 4.6% to 0.3%, the recovery rate is 98.99%, within the National Standard concentration range (50～800 mg/L).
出处
《工业水处理》
CAS
CSCD
2003年第7期44-47,共4页
Industrial Water Treatment
