GB/T 28137-2011 PDF EnglishUS$120.00 · In stock · Download in 9 seconds
GB/T 28137-2011: Testing method of persistent foaming for pesticides 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 28137-2011: Testing method of persistent foaming for pesticides---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/GBT28137-2011NATIONAL STANDARD OF THE PEOPLE’S REPUBLIC OF CHINA ICS 65.100 G 23 Testing Method of Persistent Foaming for Pesticides ISSUED ON: DECEMBER 30, 2011 IMPLEMENTED ON: APRIL 15, 2012 Issued by: General Administration of Quality Supervision, Inspection and Quarantine; Standardization Administration of the People's Republic of China. Table of ContentsForeword ... 3 1 Scope ... 4 2 Normative references ... 4 3 Testing method ... 4ForewordThis Standard was drafted in accordance with the rules given in GB/T 1.1-2009. This Standard uses the redrafting method to modify and use CIPAC MT 47 "Persistent foaming” of Collaborative International Pesticides Analytic Council. The main differences between this Standard and CIPAC MT 47 "Persistent foaming" are: -- The difference of the use of standard hard water: this Standard specifies the use of standard hard water D (342 mg/L). CIPAC MT 47 specifies the use of standard hard water C (500 mg/L). -- The difference of sampling amount: this Standard specifies a sampling amount of 1.0 g. CIPAC MT 47 does not specify the sampling amount. -- The difference of the way in reversing the measuring cylinder: the way in reversing the measuring cylinder which is specified in this Standard is that the measuring cylinder is reversed, with the middle of the cylinder as the center, by 180° up and down for 30 times (2 s each time). CIPAC MT 47 does not indicate whether the bottom of the cylinder or the middle of the cylinder is the center. -- The difference of the standing time of the measuring cylinder: this Standard specifies that the foam volume shall be recorded at 1 min ± 10 s after the measuring cylinder is inverted up and down for 30 times; CIPAC MT 47 specifies that the foam volume shall be recorded at 10 s ± 1 s, 1 min ± 10 s, 3 min ± 10 s, 12 min ± 10 s. This Standard was proposed by China Petroleum and Chemical Industry Federation. This Standard shall be under the jurisdiction of National Technical Committee 133 on Pesticides of Standardization Administration of China (SAC/TC 133). The organizations that are responsible for the drafting of this Standard: Zhejiang Research Institute of Chemical Industry. The organizations that participate in the drafting of this Standard: Jiangsu Kuaida Agrochemical Co., Ltd., Hefei Xingyu Chemical Co., Ltd. The drafters of this Standard: Fang Lu, Sun Weiping, Feng Yujie, Li Juying, Sun Hai, Chen Jie, Ding Yunhao. Testing Method of Persistent Foaming for Pesticides1 ScopeThis Standard specifies the testing method of persistent foaming for pesticides. This standard applies to pesticide products that need to be diluted with water before application.2 Normative referencesThe following documents are indispensable for the application of this document. For dated references, only the dated version applies to this document. For undated references, the latest edition (including all amendments) applies to this document. GB/T 601, Chemical reagent. Preparations of reference titration solutions GB/T 603, Chemical reagent. Preparations of reagent solutions for use in test methods GB/T 5451-2001, Testing method for the wettability of dispersible powders of pesticides3 Testing method3.1 Method summary Mix a specified amount of the sample with standard hard water; let it stand still; then, record the foam volume. 3.2 Reagents and solutions Water: grade-3 water; Magnesium oxide: before use, dry it at 105°C for more than 2 h; Calcium carbonate: before use, dry it at 105°C for more than 2 h; Hydrochloric acid solution: c(HCl) = 0.1 mol/L, prepare according to GB/T 601; Hydrochloric acid solution: c(HCl) = 1.0mol/L, prepare according to GB/T 601; ......Source: Above contents are excerpted from the full-copy PDF -- translated/reviewed by: www.ChineseStandard.net / Wayne Zheng et al. 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