Gb 11914-89
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 WebGB 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 …
Gb 11914-89
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Web《水质 化学需氧量的测定 重铬酸盐法》（GB11914-89）首次发布于1989年，原标准 起草单位为北京市化工研究院。 本次为第一次修订，修订的主要内容如下： ——将取样体积减 … http://codeofchina.com/standard/GB11914-1989.html
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. Web• Thermal digestion acc. to DIN38409 H41 and GB 11914-89 • Measuring ranges 5 to 200 mg/l O2 or 50 to 5000 mg/l O2 • Mercury-free chloride elimination • Low reagent …
http://down.foodmate.net/standard/sort/9/50737.html WebGB 11914-1989. English Name: Water quality-Determination of the chemical oxygen demand-Dichromate method. Chinese Name: 水质 化学需氧量的测定 重铬酸盐法. …
WebProduct liquid D1 after obtaining handling, by the COD value of standard GB 11914-89 water quality-COD determination-potassium dichromate method tracer liquid product D 1, the …
http://down.foodmate.net/standard/sort/3/9894.html protein threading serverWebGB/T 11914-1989 is referred in: * GB 27632-2011 Emission standard of pollutants for rubber products industry * GB 21904-2008 Discharge standards of water pollutants for … resistance in stock marketWebSep 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 … resistance in share marketWebThe COD concentrations were analysed within 24 h using the potassium dichromate method (GB 11914-89). 2.3. Substrate sampling. Substrate samples were collected using a 5 cm diameter push-core shovel at depths of −50, 30, and 10 cm below the surface on July 31, 2024. Samples of the influent side (0.3 m from the inlet site) were named A1, A2 ... protein thread liftingWebApr 25, 2013 · GB 11914-89 (1989) Water quality-determination of the chemical oxygen demand-dichromate method, National Standard of People’s Republic of China. Jasudkar … resistance in light bulb circuitWebNational 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 ... protein thinsWebThe 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 … protein threading