摘要
研究了无催化剂微波消解法测定炼油污水中的CODCr,详细考查了微波消解的有关条件,得到的最佳消解条件为:加入(S∶P=8∶1)混酸占总体积的55%,消解时间为12min,取样量为3.0mL,重铬酸钾溶液(浓度为0.15～2.0mol/L)3.0mL,功率720W。在最佳消解条件下跟踪一段时间,结果和回流法相符,相对误差在5%内。本法具有消解时间短,试剂用量少等优点,适合COD值在150～2000mg/L的炼油污水的测定。
The paper has reported a new technique that is used to measuring COD_(Cr) of refinery water with microwave digestion apparatus using no catalyzers, the optimal digesting conditions are: the ratio of sulfuric acid to phosphoric acid: S∶P=8∶1, and the use level of acid is 55 percent of total liquid; digesting time: 12 min; water sample dosage: 3.00 mL; dosage and concentration of potassium bichromate: 3.00mL, (0.15～0.20mol/L); power of microwave: 720W. It has been found that according to the optimal condition,after following a period of time,the results are true to those of reflux,the errors are not beyond 5%.The technique has advantages because of speediness and low consumption,and is adapt to measure refinery water when COD_(Cr) is at range of 150～2000 especially.
出处
《应用化工》
CAS
CSCD
2004年第1期45-47,共3页
Applied Chemical Industry
关键词
炼油污水
COD
微波消解
refinery water
COD_(Cr)
microwave digestion
