GB/T 38339-2019 English PDF

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GB/T 38339-2019: Determination of phosphorus content in fluorescent brightener products
Status: Valid

Standard ID	USD	BUY PDF	Lead-Days	Standard Title (Description)	Status
GB/T 38339-2019	139	Add to Cart	3 days	Determination of phosphorus content in fluorescent brightener products	Valid

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Basic data

Standard ID: GB/T 38339-2019 (GB/T38339-2019)
Description (Translated English): Determination of phosphorus content in fluorescent brightener products
Sector / Industry: National Standard (Recommended)
Classification of Chinese Standard: G55
Classification of International Standard: 71.100.01; 87.060.10
Word Count Estimation: 7,761
Date of Issue: 2019-12-31
Date of Implementation: 2020-11-01
Issuing agency(ies): State Administration for Market Regulation, China National Standardization Administration

GB/T 38339-2019: Determination of phosphorus content in fluorescent brightener products

---This is a DRAFT version for illustration, not a final translation. Full copy of true-PDF in English version (including equations, symbols, images, flow-chart, tables, and figures etc.) will be manually/carefully translated upon your order.
Determination of phosphorus content in fluorescent brightener products ICS 71.100.01; 87.060.10 G55 National Standards of People's Republic of China Determination of phosphorus content in fluorescent brightener products 2019-12-31 release 2020-11-01 implementation State Administration of Market Supervision Published by the National Standardization Administration

Foreword

This 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 Dye Standardization Technical Committee (SAC/TC134). This standard was drafted by. Shenyang Xinji Chemical Co., Ltd., Shenzhen Standard Dyestuff Technology Co., Ltd., and Shenyang Shenhua Institute. Co., Ltd., Shenyang Chemical Research Institute Co., Ltd., National Dye Directive Supervision and Inspection Center. The main drafters of this standard. Wang Zhenyuan, Tong Weichang, Liang Peiji, Wang Yong, Xue Yan, Ji Lanqin, Gong Wei, Tan Cheng, Wang Bei, Yang Zhenmei. Determination of phosphorus content in fluorescent brightener products

1 Scope

This standard specifies the phosphorus molybdenum blue method and phosphorus molybdenum yellow method for the determination of phosphorus content in fluorescent brightener products. This standard applies to the determination of phosphorus content in fluorescent brightener products. Phosphorus molybdenum yellow method is only applicable to the determination of phosphorous content above 500mg/kg in fluorescent brightener products.

2 Normative references

The following documents are essential for the application of this document. For dated references, only the dated version applies to this article Pieces. For undated references, the latest version (including all amendments) applies to this document. GB/T 6682-2008 Analytical laboratory water specifications and test methods

3 Principle

The sample is decomposed to decompose organic matter, and the phosphorus is completely converted into orthophosphate. Under acidic conditions, the orthophosphate and ammonium molybdate generate heterogeneity. acid. In the presence of antimony or bismuth, reduction with ascorbic acid to phosphorus antimony (bismuth) molybdenum blue; or in the presence of vanadium, formation of a stable yellow vanadium molybdenum phosphate [(NH4) 3PO4NH4VO3 · 16MoO3]. It conforms to Beer's law in a certain concentration range.

4 Reagents or materials

Laboratory water should meet the requirements of Grade III water in GB/T 6682-2008. The reagents used in this standard are Analysis of pure. 4.1 Nitric acid. 4.2 Perchloric acid. 4.3 Mixed acid. The volume ratio of perchloric acid to nitric acid is 1. 3. 4.4 Hydrochloric acid. 4.5 Hydrogen peroxide. 4.6 Sulfuric acid solution. The volume ratio of sulfuric acid to water is 1. 1. 4.7 Ammonium molybdate solution. Dissolve 13g of ammonium molybdate [(NH4) 6Mo7O24 · 4H2O] in 100mL of water and dissolve 0.35g of potassium antimony tartrate [KSbC4H4O2 · 1/2H2O] in 100 mL of water. Add ammonium molybdate solution to 300mL sulfuric acid solution under continuous stirring (4.6), then slowly add the antimony potassium tartrate solution and mix well. 4.8 Ammonium vanadyl molybdate coloration solution. Weigh 1.25g of ammonium metavanadate [H4NO3V], add.200mL of water to heat and dissolve, add 250mL after cooling Nitric acid. Also weigh 25g of ammonium molybdate, add 400mL of water to heat and dissolve, and under cooling conditions, mix the two solutions and make up to volume 1000mL. Keep away from light and cannot be used if precipitation occurs. 4.9 Ascorbic acid solution (100g/L). Dissolve 10g ascorbic acid (C6H8O6) in 100mL water. 4.10 Phosphorus standard stock solution (50mg/L). Accurately weigh 0.2197g (accurate to 0.0002g) and dry it at 110 ℃ for 2h and dry it in a desiccator After cooling for 30 min, potassium dihydrogen phosphate was dissolved in water and transferred to a 1000 mL volumetric flask.Add about 800 mL of water and 3 mL of nitrate. Acid, dilute with water to the mark and shake well. 1.00mL of this standard solution contains 50.0μg of phosphorus. It is also available in certified standard solutions. ......

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