共查询到20条相似文献,搜索用时 78 毫秒
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无汞盐光度法快速测定化学需氧量赵钦勋,杨维鹏,王淑丽(胶州市环保局266300)化学需氧量(COD)的测定普遍用重铬酸钾法(标准法)[1].此法测定时间长、试剂用量大,还要使用剧毒物质硫酸汞来掩蔽氯离子,但掩蔽效果并不理想。为此研究和实验了无汞盐光度... 相似文献
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水中紫外吸光度与COD的相关性 总被引:2,自引:1,他引:2
通过对地表水、生活污水和工业废水样品的紫外吸光度与化学需氧量(或高锰酸盐指数)测定值进行线性回归分析,得出不同类型水体的紫外吸光度与化学需氧量(或高锰酸盐指数)之间具有良好的相关性,在一定条件下,可利用测定的紫外吸光度推算出化学需氧量(或高锰酸盐指数)结果。 相似文献
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赵军 《环境监测管理与技术》1996,(6)
化学需氧量测试中硫酸-硫酸银加入方法的改进赵军(济南军区环境监测宣教中心济南250002)化学需氧量的测试中要加入硫酸-硫酸银溶液作催化剂。测定步骤规定:需从冷凝管上口慢慢地加入30mL。按此步骤,一般都是每测一样品,都得用量筒量取一次硫酸-硫酸银溶... 相似文献
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化学需氧量两种分析方法成本核算对比 总被引:1,自引:0,他引:1
顾勇国 《环境监测管理与技术》2001,13(6):31-31
目前 ,一般都采用滴定法测定化学需氧量 ,因所用试剂量大 ,分析时间较长 ,上海市嘉定区环境监测站后改用HACH公司的化学需氧量反应器和分光光度计来测定化学需氧量。通过 3年来 ,用光度法对污染源化学需氧量的监测分析 ,将这两种方法从分析成本核算的角度进行了统计和对比。1 准确度用两种方法对中国环境监测总站两个COD标样进行测定。标样保证值为 (1 0 3± 7)mg/L ,光度法测定结果为 1 0 5mg/L ,滴定法为 1 0 3mg/L ;标样保证值为 (82 6± 4 48)mg/L ,光度法测定结果为 84 1mg/L ,滴定法为 83 7mg/L。两种方… 相似文献
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向含铬废水中加入硝酸银溶液,使六价铬与银离子形成铬酸银沉淀,消除了Cr(Ⅵ)对化学需氧量(COD)测定的干扰,进而用分光光度法测定了含铬废水的COD值。 相似文献
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张景富 《环境监测管理与技术》1996,(5)
化学需氧量空白值的简易算法AEasyCalculusofCODBlankValue张景富(山东省东平县环境监测站东平271500)《水和废水监测分析方法》第三版(简称《方法》)在重铬配钾测定化学需氧量的过程中,要用重蒸水作空白试验。据有关资料[1]报... 相似文献
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使用CTL—12型化学需氧量速测仪分析废水化学需氧量,简便、快速,且方法可行,完全能满足环境监测技术要求。 相似文献
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纺织印染废水中TOC值和COD值的相关性 总被引:1,自引:0,他引:1
林晶 《环境监测管理与技术》2004,16(5):16-18
论证了纺织印染废水中TOC值和COD值的相关性,建立了COD和TOC的相关关系式。通过对实测的TOC值和COD值进行的一系列数理统计显著性检验,证实了纺织印染废水中TOC值和COD值之间具有良好的相关性,但基于生产过程、设施装置和排污情况的差异,印染企业在运用COD和TOC的相关关系式时,应根据自身的具体情况,通过实验建立相应的回归方程。 相似文献
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Zai-Chao Yang Zhi-Hui Wang Zhao-Hui Zhang 《Environmental monitoring and assessment》2011,175(1-4):321-329
A new method has been developed for the determination of chemical oxygen demand (COD) in pulping effluent using chemometrics-assisted spectrophotometry. Two calibration models were established by inducing UV-visible spectroscopy (model 1) and derivative spectroscopy (model 2), combined with the chemometrics software Smica-P. Correlation coefficients of the two models are 0.9954 (model 1) and 0.9963 (model 2) when COD of samples is in the range of 0 to 405 mg/L. Sensitivities of the two models are 0.0061 (model 1) and 0.0056 (model 2) and method detection limits are 2.02?C2.45 mg/L (model 1) and 2.13?C2.51 mg/L (model 2). Validation experiment showed that the average standard deviation of model 2 was 1.11 and that of model 1 was 1.54. Similarly, average relative error of model 2 (4.25%) was lower than model 1 (5.00%), which indicated that the predictability of model 2 was better than that of model 1. Chemometrics-assisted spectrophotometry method did not need chemical reagents and digestion which were required in the conventional methods, and the testing time of the new method was significantly shorter than the conventional ones. The proposed method can be used to measure COD in pulping effluent as an environmentally friendly approach with satisfactory results. 相似文献
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COD与TOC测定方法的比较 总被引:3,自引:0,他引:3
系统地对比了 COD和 TOC 两种水中有机污染指标测定方法原理,得出了 TOC 在直接代表水质有机污染、氧化有机物完全、产生二次污染物少、测定时间短和消耗劳动力少等方面优于 COD 的结论,并分析了 TOC 取代 COD 的难点和趋势。 相似文献
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钻井污水化学需氧量的研究 总被引:1,自引:0,他引:1
针对石油工业钻井污水高化学需氧量(COD)严重超标的状况,对钻井污水的化学需氧量进行研究。分折测定了8种钻井液添加剂(PAN、PAMI、HPAN、柴油、磺化沥青、XY27、CMC、FA367)的COD;重点探讨了钻井液添加剂对钻井污水COD的影响,同时对钻井污水COD处理效果的影响进行了研究。实验结果表明,不同钻井液添加剂对钻井污水的COD的影响程度各不相同;钻井污水中COD值严重超标的主要因素是钻井液添加剂;并且钻井液添加剂浓度与其对应的COD之间存在良好的一元线性关系。根据一元线性回归方程可较好地预测油田现场各钻井液添加剂对COD的影响,为解决钻井污水处理这一难题提供科学依据。 相似文献
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南四湖港口污染物扩散区COD降解系数的研究 总被引:1,自引:0,他引:1
本文对南四湖港口污染物扩散区内的COD降解规律进行了室内模拟试验研究,采用最小二乘法估计出了COD可降解部分的降解系数和不可降解部分的百分比,并通过方差分析验证了模型的可靠性。COD降解系数和不可降解百分比的获取,可以为预测各港口对南四湖水质变化趋势的影响,为制定相应的水污染防治规划和措施,提供了重要的基础数据。 相似文献
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我国洗衣粉消费形成的COD总量测 总被引:1,自引:0,他引:1
根据水质COD重铬酸钾法,实测了市场上5种常见品牌洗衣粉的COD负荷值,得到其平均值为0.328(w/w)(绝干洗衣粉)。由我国使用量计算得到2005年洗衣粉形成的COD总量为88.87×10^4t,这相当于当年全国工业和生活COD排放总量的6.3%,全国生活COD排放总量的10.3%,2005年我国洗衣粉消费过程COD产污系数为1.86g/(d·人),需要对洗衣粉消费形成的COD总量水平予以必要的关注。 相似文献
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Adam Faschan Marty Tittlebaum Frank Cartledge Harvill Eaton 《Environmental monitoring and assessment》1992,22(3):199-212
Several combinations of binders and absorbent additives were utilized to solidify a typical organic waste, API Separator sludge. The effectiveness of the materials was based on the waste leachability from the solidified samples. COD and TOC analyses were used to determine the organic content of the leachate samples.The ability of the COD and TOC analyses to assess waste leachability was limited. The inability of the COD and TOC tests to differentiate between organic compounds made the results difficult to interpret. This was due to organic contaminants from the solidification materials contributing to the COD and TOC contents of the leachates. Also, the COD test may have be influenced by reduced inorganic compounds contained in the flyash binder and the sludge. Representative samples for the TOC analysis were difficult to obtain for the leachates containing oils or suspended particles. It is recommended that the COD and TOC tests only be used as a screening method for determining solidified organic waste leachability and other methods need to be employed to obtain more accurate results. 相似文献
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Performance of an electrochemical COD (chemical oxygen demand) sensor with an electrode-surface grinding unit 总被引:2,自引:0,他引:2
Geun Jeong B Min Yoon S Ho Choi C Koang Kwon K Sik Hyun M Heui Yi D Soo Park H Kim M Joo Kim H 《Journal of environmental monitoring : JEM》2007,9(12):1352-1357
An electrochemical COD (chemical oxygen demand) sensor using an electrode-surface grinding unit was investigated. The electrolyzing (oxidizing) action of copper on an organic species was used as the basis of the COD measuring sensor. Using a simple three-electrode cell and a surface grinding unit, the organic species is activated by the catalytic action of copper and oxidized at a working electrode, poised at a positive potential. When synthetic wastewater was fed into the system, the measured Coulombic yields were found to be dependent on the COD of the synthetic wastewater. A linear correlation between the Coulombic yields and the COD of the synthetic wastewater was established (10-1000 mg L(-1)) when the electrode-surface grinding procedure was activated briefly at 8 h intervals. When various kinds of wastewater samples obtained from various sewage treatment plants were measured, linear correlations (r(2)> or = 0.92) between the measured EOD (electrochemical oxygen demand) value and COD of the samples were observed. At a practical wastewater treatment plant, the measurement system was successfully operated with high accuracy and good stability over 3 months. These experimental results show that the application of the measurement system would be a rapid and practical method for the determination of COD in water industries. 相似文献