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GB/T 11446.6-2013 PDF English

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GB/T 11446.6-2013: Test method for SiO2 in electronic grade water by spectrophotometer
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GB/T 11446.6: Evolution and historical versions

Standard IDContents [version]USDSTEP2[PDF] deliveryName of Chinese StandardStatus
GB/T 11446.6-2013English120 Add to Cart 0-9 seconds. Auto-delivery Test method for SiO2 in electronic grade water by spectrophotometer Valid
GB/T 11446.6-1997English199 Add to Cart 2 days Test method for SiO2 in electronic grade water by spectrophotometer Obsolete
GB 11446.6-1989English199 Add to Cart 2 days Test method for silica in electronic grade water by spectrophotometer Obsolete

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GB/T 11446.6-2013: Test method for SiO2 in electronic grade water by spectrophotometer

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GB NATIONAL STANDARD OF THE PEOPLE’S REPUBLIC OF CHINA ICS 31-030 L 90 Replacing GB/T 11446.6-1997 Test method for SiO2 in electronic grade water by Issued on. DECEMBER 31, 2013 Implemented on. AUGUST 15, 2014 Issued by. General Administration of Quality Supervision, Inspection and Quarantine of PRC; Standardization Administration of PRC.

Table of Contents

Foreword... 3 1 Scope... 5 2 Normative references... 5 3 Terms and definitions... 5 4 Principles of the method... 5 5 Disturbing factors... 6 6 Reagents... 6 7 Instruments and utensils... 7 8 Sampling... 8 9 Operation procedures... 8 10 Detection limit and relative deviation... 10 11 Report... 10

Foreword

The expected structure of GB/T 11446 is as follows. - GB/T 11446.1 Electronic grade water; - GB/T 11446.2 (To be determined); - GB/T 11446.3 Generic rules for test methods of electronic grade water; - GB/T 11446.4 Test method for resistivity of electronic grade water; - GB/T 11446.5 Test method for measuring trace metals in electronic grade water by atomic absorption spectrophotometry; - GB/T 11446.6 Test method for SiO2 in electronic grade water by spectrophotometer; - GB/T 11446.7 Test method for trace anion in electronic grade water by ion chromatography; - GB/T 11446.8 Test method for total organic carbon in electronic grade water; - GB/T 11446.9 Test method for particles in electronic grade water by instrument; - GB/T 11446.10 Test method for total bacterial count in electronic grade water by membrane filters. This part is Part 6 of GB/T 11446. This part was drafted in accordance with the rules given in GB/T 1.1-2009. This part replaces GB/T 11446.6-1997 "Test method for SiO2 in electronic grade water by spectrophotometer". Compared with GB/T 11446.6-1997, this Part mainly has the following changes. - MODIFY "9 Disturbing factors" to "5 Disturbing factors" (see Chapter 5); - In "Drawing of the working curve", according to the silica content in the water sample to be tested, clearly DIVIDE the working curve into two groups (see 9.1.1 and 9.1.2); - ADD that "Make two independent determinations of water samples; take the average value" (see 9.3.3). This Part was proposed by the Ministry of Industry and Information Technology of the People's Republic of China. This Part shall be under the jurisdiction of China Electronic Technology Standardization Institute. Drafting organizations of this Part. Special Material Quality Supervision and Inspection Center of the Ministry of Information Industry, Institute of Semiconductors of Chinese Academy of Sciences, China Electronics Standardization Institute, 46th Research Institute of China Electronics Technology Group Corporation. The main drafters of this Part. Wang Yi, Chu Lianqing, He Xiukun, Duan Shuguang, Ti Liuwang, Liu Yun. This standard replaces the standard previously issued as follows. - GB/T 11446.6-1989, GB/T 11446.6-1997. Test method for SiO2 in electronic grade water by spectrophotometer

1 Scope

This Part of GB/T 11446 specifies the spectrophotometric test method for silicon dioxide, in electronic grade water. This Part applies to the determination of silicon dioxide, in electronic grade water, where the detection limit is 1 μg/L.

2 Normative references

The following documents are essential to the application of this document. For the dated documents, only the versions with the dates indicated are applicable to this document; for the undated documents, only the latest version (including all the amendments) is applicable to this standard. GB/T 11446.1-2013 Electronic grade water

3 Terms and definitions

The terms and definitions as defined in GB/T 11446.3-2013, as well as the following terms and definitions, are applicable to this document.

4 Principles of the method

Soluble silicon in water reacts with ammonium molybdate, in an acidic medium (pH = 1 ~ 2), to produce yellow silicon copper heteropoly acid (NH4)2H6[Si(MO2O7)6]·H2O.

5 Disturbing factors

5.1 Phosphate and arsenate, etc. generate the corresponding blue heteropoly acid, under the measurement conditions. The oxalic acid, tartaric acid and other hydroxy acids can be used, to eliminate the interference from arsenic and phosphorus. 5.4 The water sample shall be analyzed as soon as possible. The longer the storage time, the greater the possibility of contamination.

6 Reagents

6.1 Blank water EW-I electronic grade water, which is specified in GB/T 11446.1-2013. 6.2 Silicon standard solution 6.3 Ammonium molybdate solution (100 g/L) The analytically pure ammonium molybdate is purified by two recrystallizations. 6.4 Oxalic acid solution or tartaric acid or citric acid solution (100 g/L) Weigh 100 g of oxalic acid or tartaric acid or citric acid. Dissolve it in 500 mL water. Use water to dilute to 1 L (if the solution is turbid, filter it). Store it in a polyethylene bottle. 6.5 1-Amino-2-naphthol-4-sulfonic acid reducing agent solution Weigh 1.5 g of 1-amino-2-naphthol-4-sulfonic acid AND 7 g of anhydrous sodium sulfite. Dissolve it in 200 mL of water. 6.6 Hydrochloric acid (1+1) Hydrochloric acid, which is purified by distillation or absorption. 6.7 Hydrofluoric acid (1+99) Hydrofluoric acid, which is purified by a platinum distiller. 6.8 Boric acid solution Saturated solution, which is prepared by boric acid, after purified by recrystallization.

7 Instruments and utensils

7.1 Spectrophotometer. The working wavelength is 200 nm ~ 1000 nm; the wavelength accuracy is ±1.5 nm; the transmittance range is 0 ~ 100%; the transmittance repeatability is ±0.5%; the absorbance measurement range is 0.04 ~ 2; the cuvette is 1 cm, 2 cm, 5 cm, 10 cm. 7.5 Polyethylene bottle (cup). 100 mL, 1000 mL. 7.6 Glassware with complete specifications. 7.7 Polyethylene volumetric flask. 50 mL, 100 mL.

8 Sampling

The water container, which is used to analyze silicon, shall use plastic containers, such as polyethylene, according to Chapter 4 of GB/T 11446.1-2013.

9 Operation procedures

9.1 Drawing of working curve 9.1.1 The silica content in the water sample to be tested is 1 μg/L ~ 200 μg/L 9.1.2 The silica content in the water sample to be tested is 100 μg/L ~ 2000 μg/L 9.3 Water sample determination 9.3.1 Determination of soluble silicon Take 50 mL of water sample in a polyethylene bottle. Follow the steps in 9.1, to use blank water as a reference, for photometric determination. Find the silica content, which is corresponding to the difference, between the absorbance of the reagent and the absorbance of the reagent blank, from the working curve, which is content of soluble silicon in the water sample.

10 Detection limit and relative deviation

This method analyzes the silica content in electronic grade water. The detection limit is 1 μg/L. For the analysis of 10 μg/L (silica) water, the relative deviation is 8%.

11 Report

The test report shall be prepared, according to the format, given in GB/T 11446.3-2013. ......
Source: Above contents are excerpted from the full-copy PDF -- translated/reviewed by: www.ChineseStandard.net / Wayne Zheng et al.


      

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