GB/T 19203-2003 PDF EnglishUS$70.00 · In stock · Download in 9 seconds
GB/T 19203-2003: Determination of calcium, magnesium and sulphur content for compound fertilizer 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 19203-2003: Determination of calcium, magnesium and sulphur content for compound fertilizer---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/GBT19203-2003GB NATIONAL STANDARD OF THE PEOPLE’S REPUBLIC OF CHINA ICS 65.080 G 20 Determination of calcium, magnesium and sulphur content for compound fertilizer Issued on: JUNE 23, 2003 Implemented on: DECEMBER 1, 2003 Issued by. General Administration of Quality Supervision, Inspection and Quarantine of People’s Republic of China Table of ContentsForeword ... 3 1 Scope ... 4 2 Normative references ... 4 3 Test methods ... 4ForewordThis Standard refers to the International standard ISO 10084.1992 Solid fertilizers - Determination of mineral-acid-soluble sulfate content - Gravimetric method for the determination of sulphur content for compound fertilizer. The determination of calcium and magnesium content uses EDTA volumetric method. This Standard was proposed by China Petroleum and Chemical Industry Association. This Standard shall be under the jurisdiction of National Technical Committee on Fertilizers and Soil Conditioning Agents of Standardization Administration of China. The drafting organizations of this Standard. Shanghai Chemical Industry Research Institute, China-Arab Fertilizer Company Limited. Main drafters of this Standard. Fan Bin, Wang Lianjun, Zhang Qiuzhen, Wang Yin, Du Xianlan, Liu Gang, Liu Yun. Determination of calcium, magnesium and sulphur content for compound fertilizer1 ScopeThis Standard specifies the determination of total calcium, magnesium and sulphur content in compound fertilizer. This Standard is applicable to the determination of total calcium, magnesium and sulphur content in all kinds of compound fertilizers.2 Normative referencesThe following standards contain the provisions which, through reference in this Standard, constitute the provisions of this Standard. For dated references, subsequent amendments (excluding corrections) or revisions do not apply to this Standard. However, the parties who enter into agreement based on this Standard are encouraged to investigate whether the latest versions of these documents are applicable. For undated reference documents, the latest versions apply to this Standard. GB/T 8571 Preparation of laboratory samples for compound fertilizers HG/T 2843-1997 Chemical fertilizer Products-standard volumetric, standard, reagent and indicator solutions for chemical analysis3 Test methods3.1 General provisions The preparation of reagents, water and solutions used in this Standard, in the absence of specifications and preparation methods, it shall be in accordance with the provisions of HG/T 2843-1997. 3.2 Laboratory sample preparation Prepare the laboratory sample according to the provisions of GB/T 8571. 3.3 Preparation of sample solution 3.3.1 Reagents and materials 3.4.2.6 Ammonia-ammonium chloride buffer solution. pH ≈ 10; prepare it according to the method in 9.5.1 of HG/T 2843-1997; 3.4.2.7 Disodium edetate (EDTA) standard titration solution. c(EDTA) = 0.02 mol/L; 3.4.2.8 Malachite green indicator solution. 1 g/L; 3.4.2.9 Calcein - methyl thymol blue indicator (referred to as calcein indicator). grind and well mix 0.10 g of calcein and 0.10 g of methyl thymol blue (or methyl thymol blue), 0.03 g of thymol phenolphthalein, 5 g of potassium chloride; store in grinding mouth bottle, it is ready for later use; 3.4.2.10 Acid chrome blue K-naphthol green B mixed indicator (referred to as K-B indicator). 3.4.3 Apparatus General laboratory instruments. 3.4.4 Analysis steps 3.4.4.1 Determination of total calcium content 3.4.4.1.1 Content determination Accurately pipet a certain amount of sample solution (less than 15 mg, in Ca) in an Erlenmeyer flask. Add 50 mL of water, 10 mL of starch solution, 8 mL of triethanolamine solution, 1 mL of ethylenediamine, 1 drop of malachite green indicator solution. Drop-add potassium hydroxide solution till it is colorless. And add an excess of 10 mL. Add 0.1 g of hydroxylamine hydrochloride (each reagent must be well shaken when it is added). Add 0.1 g ~ 0.3 g of calcium yellow indicator. On a black background, immediately use disodium edetate (EDTA) standard titration solution to titrate till green fluorescence disappears. It shall be the end of titration when it appears in purple-red. 3.4.4.1.2 Blank test Except that sample is not added, it must use reagents, dosage and analysis steps which are identical with sample determination to carry out the parallel test. 3.4.5 Expression of analysis results 3.4.5.1 Total calcium (in Ca) content w1, expressed in mass fraction (%), shall be calculated according to equation (1). ......Source: Above contents are excerpted from the full-copy PDF -- translated/reviewed by: www.ChineseStandard.net / Wayne Zheng et al. Tips & Frequently Asked Questions:Question 1: How long will the true-PDF of English version of GB/T 19203-2003 be delivered?Answer: The full copy PDF of English version of GB/T 19203-2003 can be downloaded in 9 seconds, and it will also be emailed to you in 9 seconds (double mechanisms to ensure the delivery reliably), with PDF-invoice.Question 2: Can I share the purchased PDF of GB/T 19203-2003_English with my colleagues?Answer: Yes. 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