排序方式: 共有14条查询结果,搜索用时 28 毫秒
1.
张忠 《石油化工环境保护》2006,29(1):51-53
介绍了HBCOD-1型COD在线自动监测仪的测定原理、分析流程和性能特点。仪器采用重铬酸钾氧化水中有机物和还原性无机物,通过分光光度法测定水中化学耗氧量(COD值)。与国标方法进行线性回归校正后,仪器测定值与国标方法测得的CODCr,值具有较好的一致性。 相似文献
2.
采用简便的沉淀法制备的纳米氧化锌为光催化荆,重铬酸钾为光生电子接受体,研究了纳米氧化锌-重铬酸钾体系测定COD的方法.COD值在1~100mg/L之间有良好的线性关系,线性方程为y=0.0007χ 0.0069,相关系数为r=0.9992,检测限为0.66mg,L.采用本方法和CODM.国标法对不同水体样品进行比较测定发现,对低COD值样品本方法加标回收率在96.3%~100.6%之间,变异系数Cv%=1.1~3.4,准确度和精密度均优于CODMn国标法,弥补了低COD值样品国标法(CODmn)测定不准确的不足,且单个样品测定时间短,具有推广应用价值. 相似文献
3.
氯气校正法(HJ/T70-2001)是测定高氯废水化学需氧量的国标方法,为了减少样品测定过程带来的环境污染,研究在不改变HJ/T70-2001氧化体系及测试条件的情况下,将取样体积由20 mL减半为10 mL,试剂的使用量相应减半,对方法的检出限、相对误差、相对标准偏差等指标进行验证。结果表明,该方法的检出限符合要求,准确度较高,精密度较好,可用于高氯废水化学需氧量的测定。 相似文献
4.
COD分光光度法与标准方法对比实验 总被引:3,自引:0,他引:3
CODcr分光光度快速测定法具有简便,快速,节能,省试剂等优点。其测定结果与标准方法之间有良好的可比性,最低检测限为5.0mg/l 。 相似文献
5.
Earthworms’ body works as a ‘biofilter’ and they have been found to remove the 5 days’ BOD (BOD5) by over 90%, COD by 80–90%, total dissolved solids (TDS) by 90–92%, and the total suspended solids (TSS) by 90–95% from
wastewater by the general mechanism of ‘ingestion’ and biodegradation of organic wastes, heavy metals, and solids from wastewater
and also by their ‘absorption’ through body walls. Earthworms increase the hydraulic conductivity and natural aeration by
granulating the clay particles. They also grind the silt and sand particles, increasing the total specific surface area, which
enhances the ability to ‘adsorb’ the organics and inorganic from the wastewater. Intensification of soil processes and aeration
by the earthworms enable the soil stabilization and filtration system to become effective and smaller in size. Suspended solids
are trapped on top of the vermifilter and processed by earthworms and fed to the soil microbes immobilized in the vermifilter.
There is no sludge formation in the process which requires additional expenditure on landfill disposal. This is also an odor-free
process and the resulting vermifiltered water is clean and disinfected enough to be reused for farm irrigation and in parks
and gardens
G. Bharambe—GU & Research Assistant (Under Rajiv K. Sinha), U. Chaudhari—GU (Worked on vermiculture project). 相似文献
6.
A potential new commercial method for processing leather to reduce environmental impact 总被引:1,自引:0,他引:1
Bhavan S Rao JR Nair BU 《Environmental science and pollution research international》2008,15(4):293-295
INTRODUCTION: Current leather processing method involves dehairing and fibre opening employing lime and sulphide, which results in higher negative impact on the environment due to its uncleanness. This method of dehairing and fibre-opening process accounts for nearly 70-80% biochemical oxygen demand and chemical oxygen demand (COD) in tannery wastewater and also the generation of H(2)S gas. MATERIALS AND METHODS: Hence, an attempt has been made to reduce the environmental impact of the leather processing through a biochemical approach, employing proteolytic enzyme and sodium metasilicate for performing the above process more cleanly. RESULTS AND DISCUSSION: The developed process exhibits significant reduction in environmental parametres such as COD and total solid loads by 55% and 25%, respectively. This method completely avoids the formation of lime sludge. CONCLUSION: The functional properties of the leathers are also on par with conventionally processed leathers. Further, the process seems to be commercially viable. 相似文献
7.
随着社会和经济的快速发展,环境污染事故尤其是突发性水污染事故,不仅在发生次数上,而且在污染的危害程度上有增大趋势。应急监测是突发性环境污染事故处置与善后处理中的重要环节。用真空检测管-电子比色法测定水和废水中的化学需氧量,实验结果表明,该方法的准确度和精密度较高。方法最低检出限为10 mg/L,回收率为89.0%~105%,相对标准偏差为1.8%~12.3%,相对误差为-2.38%~+8.80%。用重铬酸盐法和真空检测管法测定实际样品,2种方法相对误差为-34.7%~+6.86%,能满足半定量检测要求,符合环境应急监测分析的要求。 相似文献
8.
Degradation of the herbicide imazapyr by Fenton reactions 总被引:4,自引:0,他引:4
Ghizlaine Kaichouh Nihal Oturan Mehmet A. OturanEmail author Kacem El Kacemi Abderrahim El Hourch 《Environmental Chemistry Letters》2004,2(1):31-33
The degradation of the herbicide imazapyr has been carried out by three advanced oxidation processes involving iron ions as catalysts: Fentons reagent, photo-Fenton and electro-Fenton. We show that all processes are rapid and efficient. The kinetic rate constant was found to be
k=5.4×109 M–1
s–1. The mineralization of imazapyr is almost complete using the photo-Fenton and electro-Fenton processes. 相似文献
9.
Xiaohua Fu Qingxing Zheng Guomin Jiang Kallol Roy Lei Huang Chang Liu Kun Li Honglei Chen Xinyu Song Jianyu Chen Zhenxing Wang 《Frontiers of Environmental Science & Engineering》2023,17(8):98
10.
本文通过测定三种前处理方法消解后水样中汞的浓度,分析了前处理方法对测定结果的影响,以及三种前处理方法的适用条件。 相似文献