Gb 11914-89
WebThe COD is analyzed by the dichromate method (GB 11914-89), in which K 2 Cr 2 O 7 is used to oxidize the COD in the analyzed water, and the NH 3 -N content is tested by an … WebMar 25, 2024 · Issuing agency (ies) Ministry of Environment Protection. HJ 828-2024. NATIONAL ENVIRONMENTAL PROTECTION STANDARD. OF THE PEOPLE’S REPUBLIC OF CHINA. Replacing GB 11914-89. Water quality - Determination of the chemical oxygen. demand - Dichromate method. ISSUED ON: MARCH 30, 2024.
Gb 11914-89
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WebSS Gravimetric method (GB 11901-89) COD Dichromate method (GB 11914-89) BOD 5 5-day BOD test TN Alkaline potassium per-sulfate digestion—UV spectrophotometric method (GB11894-89) NH 3 +–N Nessler’s reagent colormetric method (GB7974-87) NO 3 −–N phenoldisulfonic acid spectrophotometric method (GB 7480-87) NO 2 WebSep 29, 2024 · The COD value of MB solution before and after treatment was determined according to GB-11914-89 standard, and was calculated according to formula . $$ {\text{COD (ppm)}} = \frac{{C \times (V_{0} - V_{1} )}}{{V_{2} }} \times f, $$ ... but the nitrogen element content was only 2.89% according to formula , indicating the content of direct …
WebDec 31, 2011 · recommended in GB 11914-89 (Dic hromate method to determination the c hemical oxygen demand of the water quality) to get the standard COD value of the sample, and then we measured its permanganate ... Webing to Chinese standard methods (GB 11914-89) a er ltration by 0.45 mm lters. UV-Vis absorption spectra were detected by …
Web本文档为【(完整word版)COD标准测定方法国标GB11914-89化学需氧量的测定】，请使用软件OFFICE或WPS软件打开。作品中的文字与图均可以修改和编辑， 图片更改请在作品中右键图片并更换，文字修改请直接点击文字进行修改，也可以新增和删除文档中的内容。 http://down.foodmate.net/standard/sort/3/9894.html
WebNational standard GB 11914-89 specification analysis method to make the water quality of the determination of chemical oxygen demand (COD) COD (cr) steps, strictly stipulated the method of heating digestion time, solution acidity, the dosage of the catalyst and oxidant conditions. It is obvious that water quality determination of COD (cr) is ...
http://down.foodmate.net/standard/sort/9/50737.html l jokerWebMay 1, 2024 · This standard specifies the dichromate method used to determine chemical oxygen demand in surface water, municipal wastewater, and industrial sewage. This … l jones joinery ltdWebsical method (GB 11914-89) [6]. Consequently, during the supervision of law enforcement, the COD determination of samples with high requirements such as discharge sample, assessment sample, arbitration analysis sample is preferred by the classical method (GB 11914-89). Considering the current research situation mentioned above, the aim of the l jonesWebNov 19, 2024 · Chemical oxygen demand (COD) was measured based on a National Standard of People’s Republic of China GB 11914-89 (Water quality—Determination of … l jones joinery newcastleWebGB 11914-89 Water quality - Determination of the chemical oxygen demand - Dichromate method When the above standard is revised, the latest version shall be used. 3 … l joseph kennington md moWebThe COD is analyzed by the dichromate method (GB 11914-89), in which K 2 Cr 2 O 7 is used to oxidize the COD in the analyzed water, and the NH 3 -N content is tested by an online ammonia analyzer. ... l josephWebDec 13, 2013 · The COD of the water was detected according to Chinese standard GB 11914-89. And the chrominance was determined by dilution method provided by the Chinese standard GB 11903-89. The pH value was detected using a pH211 desktop pH meter (HANNA, Italy). 2.4. UV–Vis analysis. l julian