1) the means of potassium dichromate ofdifferent concentration
分段重铬酸钾法
2) potassium dichromate method
重铬酸钾法
1.
The comparison of monitoring COD in water with rapid monitoring method and potassium dichromate method is finished.
比较了快速测定法与国家标准方法重铬酸钾法(GB11914-89)测定化学需氧量。
2.
Based on the operation and management experience of on-line COD_(Cr) analyzer,several suggestions are put forward,including replacing ferrous ammonium sulfate by potassium hydrogen phthalate as range-measured solution,replacing zero offset by beginning offset,and inspecting the compatibility of analyzer to water quality when the potassium dichromate method is not used.
根据水质CODCr在线分析仪运行管理工作的经验,提出以邻苯二甲酸氢钾代替硫酸亚铁铵作为量程测定液,以始点漂移代替零点漂移,以及对于非重铬酸钾法测定CODCr仪器检验,要考察其对水质的适应性的几点建议。
3.
the improved method had advantages of fewer quantity of acid,less heating time and low cost over the potassium dichromate method of national standard.
废水中化学耗氧量的测定 ,国标用重铬酸钾法 ,该方法不仅酸介质用量大 ,而且需 2h加热。
3) potassium dichromate
重铬酸钾法
1.
Discussion of influencing factors on COD_(Cr) determination in industrial waste drainage by potassium dichromate;
用重铬酸钾法测定工业废水中COD_(Cr)影响因素的探讨
2.
Rapid determination of COD in water sample by using potassium dichromate;
改进重铬酸钾法快速测定水样CODcr
4) dichromate method
重铬酸钾法
1.
The common methods to measure include dichromate method which is used to determinate the more serious pollution of industrial waste water; and permanganate method which is applicable to the determination of surface water pollution and sewage.
常用的测定方法有重铬酸钾法和高锰酸钾法,前者适用于测定污染较为严重的工业废水,后者适用于测定污染较轻的地表水和生活污水。
5) potassium dichromate standard method
重铬酸钾标准法
6) potassium dichromate method passivation
重铬酸钾法钝化
补充资料：铬酸钾
铬酸钾化学式K2CrO4，分子量194.20。黄色斜方晶体，密度2.732g/cm3，熔点968.3℃。溶于水成深黄色溶液，溶液中性，不溶于酒精及乙醚中。性毒。有氧化性。水溶液中加入硫酸后溶液变成橙红色，这是由于生成了重铬酸钾的原故
2K2CrO4+H2SO4 =K2CrO7+K2SO4 +H2O
铬酸钾加热变成红色，冷却后又重新变为黄色。用做氧化剂，媒染剂和金属防锈剂。还用于银、钡等的微量分析、鞣革、制药等。把磨细的铬铁矿跟氢氧化钾、石灰石一起煅烧后，再加入硫酸钾溶液，便可制得铬酸钾。
说明：补充资料仅用于学习参考，请勿用于其它任何用途。
参考词条