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GB/T 37905-2019: Reclaimed water quality - Determination of chromium - Voltammetry and polarography Delivery: 9 seconds. True-PDF full-copy in English & invoice will be downloaded + auto-delivered via email. See step-by-step procedure Status: Valid
Similar standardsGB/T 37905-2019: Reclaimed water quality - Determination of chromium - Voltammetry and polarography---This is an excerpt. Full copy of true-PDF in English version (including equations, symbols, images, flow-chart, tables, and figures etc.), auto-downloaded/delivered in 9 seconds, can be purchased online: https://www.ChineseStandard.net/PDF.aspx/GBT37905-2019 (Water quality of reclaimed water - Determination of chromium voltamographic method) ICS 13.060.50; 71.040.40 G76 National Standards of People's Republic of China Determination of chromium in reclaimed water - Voltammetric polarography Reclaimedwaterquality-Determinationofchromium- Voltammetry andpolarography Published on.2019-08-30 2020-07-01 implementation State market supervision and administration China National Standardization Administration issued ForewordThis standard was drafted in accordance with the rules given in GB/T 1.1-2009. This standard was proposed by the China Petroleum and Chemical Industry Federation. This standard is under the jurisdiction of the National Chemical Standardization Technical Committee (SAC/TC63). This standard was drafted. Tongji University, Henan Qingshuiyuan Technology Co., Ltd., Guangzhou Special Pressure Equipment Testing Institute, CNOOC Tianjin Chemical Research and Design Institute Co., Ltd., Shenzhen Junnuo Testing Co., Ltd., Metrohm China Ltd., Chongqing University, Zhejiang Shuizhiyin Environmental Protection Technology Co., Ltd., Tianjin Zhengda Technology Co., Ltd. The main drafters of this standard. Wang Ying, Yang Haixing, Liu Juan, Li Lin, Wen Guanyong, Yu Hongwei, Zheng Huaili, Zhu Chunlian, Rong Xiuli, Shao Hongqian. Determination of chromium in reclaimed water - Voltammetric polarography1 ScopeThis standard specifies the test method for total chromium, hexavalent chromium and trivalent chromium in reclaimed water--voltammetric polarography. This standard applies to the determination of the mass concentration of chromium in reclaimed water, the measurement range is 1.0μg/L ~ 100μg/L. This standard also applies to Determination of total chromium, hexavalent chromium and trivalent chromium in drinking water, surface water, sewage.2 Normative referencesThe following documents are indispensable for the application of this document. For dated references, only dated versions apply to this article. Pieces. For undated references, the latest edition (including all amendments) applies to this document. Preparation of standard solution for GB/T 602 chemical reagent impurity determination GB/T 6682 Analytical laboratory water specifications and test methods3 Terms and definitionsThe following terms and definitions apply to this document. 3.1 Pre-electrolysis pre-electrolysis Under certain potential and agitation conditions, a certain period of time is prescribed to electrolyze and concentrate part of the analyte onto the working electrode. 3.2 Electrolyte electrolytetesolution A solution used to dissolve a sample for voltammetric polarography. 3.3 Dissolution scan determination determinationofstrippingandsweep After enrichment, the potential is changed from positive to negative, and the potential is changed linearly at a certain scanning rate. This process will be enriched to work electricity The analyte on the electrode was dissolved and the stripping voltammetry curve was recorded. 3.4 Non-stoichiometric methodmethodnon-chemical Under certain conditions, the analyte is partially electrolyzed and dissolved by a quantitative electrochemical reaction, and passed through the standard of electrolysis and dissolution under the same conditions. The method of comparing the quasi-objects to calculate the content of the analyte.4 Method summaryUsing the principle of non-stoichiometry, the hexavalent chromium in the water sample reacts with diethylenetriaminepentaacetic acid (DTPA) to produce a certain product. Within the current and voltage range, it is adsorbed and enriched on the suspended mercury electrode. When the electrode potential is uniformly scanned from the positive negative direction, the potential can be enriched When the complex reacts, the metal complex enriched on the electrode forms ions into the solution, and the half-wave is utilized according to the obtained voltammetry curve. The position was qualitatively analyzed, quantitative analysis was performed based on the peak height, and the content of the hexavalent chromium ion to be tested was calculated by the standard addition method. When measuring total chromium, All chromium is first oxidized to hexavalent chromium in the presence of a strong oxidant and then measured. Trivalent chromium content from total chromium and hexavalent chromium GB/T 37905-2019 (Water quality of reclaimed water - Determination of chromium voltamographic method) ICS 13.060.50; 71.040.40 G76 National Standards of People's Republic of China Determination of chromium in reclaimed water - Voltammetric polarography Reclaimedwaterquality-Determinationofchromium- Voltammetry andpolarography Published on.2019-08-30 2020-07-01 implementation State market supervision and administration China National Standardization Administration issuedForewordThis standard was drafted in accordance with the rules given in GB/T 1.1-2009. This standard was proposed by the China Petroleum and Chemical Industry Federation. This standard is under the jurisdiction of the National Chemical Standardization Technical Committee (SAC/TC63). This standard was drafted. Tongji University, Henan Qingshuiyuan Technology Co., Ltd., Guangzhou Special Pressure Equipment Testing Institute, CNOOC Tianjin Chemical Research and Design Institute Co., Ltd., Shenzhen Junnuo Testing Co., Ltd., Metrohm China Ltd., Chongqing University, Zhejiang Shuizhiyin Environmental Protection Technology Co., Ltd., Tianjin Zhengda Technology Co., Ltd. The main drafters of this standard. Wang Ying, Yang Haixing, Liu Juan, Li Lin, Wen Guanyong, Yu Hongwei, Zheng Huaili, Zhu Chunlian, Rong Xiuli, Shao Hongqian. Determination of chromium in reclaimed water - Voltammetric polarography1 ScopeThis standard specifies the test method for total chromium, hexavalent chromium and trivalent chromium in reclaimed water--voltammetric polarography. This standard applies to the determination of the mass concentration of chromium in reclaimed water, the measurement range is 1.0μg/L ~ 100μg/L. This standard also applies to Determination of total chromium, hexavalent chromium and trivalent chromium in drinking water, surface water, sewage.2 Normative referencesThe following documents are indispensable for the application of this document. For dated references, only dated versions apply to this article. Pieces. For undated references, the latest edition (including all amendments) applies to this document. Preparation of standard solution for GB/T 602 chemical reagent impurity determination GB/T 6682 Analytical laboratory water specifications and test methods3 Terms and definitionsThe following terms and definitions apply to this document. 3.1 Pre-electrolysis pre-electrolysis Under certain potential and agitation conditions, a certain period of time is prescribed to electrolyze and concentrate part of the analyte onto the working electrode. 3.2 Electrolyte electrolytetesolution A solution used to dissolve a sample for voltammetric polarography. 3.3 Dissolution scan determination determinationofstrippingandsweep After enrichment, the potential is changed from positive to negative, and the potential is changed linearly at a certain scanning rate. This process will be enriched to work electricity The analyte on the electrode was dissolved and the stripping voltammetry curve was recorded. 3.4 Non-stoichiometric methodmethodnon-chemical Under certain conditions, the analyte is partially electrolyzed and dissolved by a quantitative electrochemical reaction, and passed through the standard of electrolysis and dissolution under the same conditions. The method of comparing the quasi-objects to calculate the content of the analyte.4 Method summaryUsing the principle of non-stoichiometry, the hexavalent chromium in the water sample reacts with diethylenetriaminepentaacetic acid (DTPA) to produce a certain product. Within the current and voltage range, it is adsorbed and enriched on the suspended mercury electrode. When the electrode potential is uniformly scanned from the positive negative direction, the potential can be enriched When the complex reacts, the metal complex enriched on the electrode forms ions into the solution, and the half-wave is utilized according to the obtained voltammetry curve. The position was qualitatively analyzed, quantitative analysis was performed based on the peak height, and the content of the hexavalent chromium ion to be tested was calculated by the standard addition method. When measuring total chromium, All chromium is first oxidized to hexavalent chromium in the presence of a strong oxidant and then measured. Trivalent chromium content from total chromium and hexavalent chromium ......Source: Above contents are excerpted from the full-copy PDF -- translated/reviewed by: www.ChineseStandard.net / Wayne Zheng et al. |