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GB/T 11446.5-2013: Test method for measuring trace metals in electronic grade water by atomic absorption spectrophotometry Delivery: 9 seconds. True-PDF full-copy in English & invoice will be downloaded + auto-delivered via email. See step-by-step procedure Status: Valid GB/T 11446.5: Historical versions
Similar standardsGB/T 11446.5-2013: Test method for measuring trace metals in electronic grade water by atomic absorption spectrophotometry---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/GBT11446.5-2013 GB NATIONAL STANDARD OF THE PEOPLE’S REPUBLIC OF CHINA ICS 31-030 L 90 Replacing GB/T 11446.5-1997 Test method for measuring trace metals in electronic grade water by atomic absorption spectrophotometry 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 ContentsForeword... 3 1 Scope... 5 2 Normative references... 5 3 Terms and definitions... 5 4 Principles of the method... 6 5 Disturbing factors... 6 6 Reagents... 6 7 Measuring instruments... 7 8 Operation procedures... 7 9 Precision... 8 10 Report... 9 Appendix A (Informative) Instrument working conditions... 10ForewordThe 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 5 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 11446.5-1997 "Test method for measuring trace metals in electronic grade water by atomic absorption spectrophotometry". Compared with GB/T 11446.5-1997, this Part mainly has the following changes. - In "1 Scope", ADD the test method for the determination of trace metal iron and lead in electronic grade water, by the use of flameless (or flame) atomic absorption spectrophotometer. It is stipulated that "other instruments, which have an equivalent sensitivity, can also be used, such as inductively coupled plasma/mass spectrometer (or inductively coupled plasma emission spectrometer)" (see Chapter 1); - ADD the test method for the determination of trace metal iron and lead in electronic grade water, by the use of the flameless (or flame) atomic absorption spectrophotometer, to this standard; - ADD "3 Terms and definitions" (see Chapter 3); - ADD "5 Disturbing factors" (see Chapter 5); - DELETE "9 Precautions" (Chapter 9 of the 1997 edition). 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 Electronics 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. Chu Lianqing, Wang Yi, He Xiukun, Duan Shuguang, Ti Liu Wang, Liu Yun. This standard replaces the standard previously issued as follows. - GB/T 11446.5-1989, GB/T 11446.5-1997. Test method for measuring trace metals in electronic grade water by atomic absorption spectrophotometry1 ScopeThis Part of GB/T 11446 specifies the test method, for the determination of trace metals copper, zinc, nickel, iron, lead, sodium, potassium, in electronic grade water, by a flameless (or flame) atomic absorption spectrophotometer. Other instruments, which have comparable sensitivity, such as inductively coupled plasma/mass spectrometer (or inductively coupled plasma emission spectrometer) can also be used, for measurement. Flameless atomic absorption spectrophotometry is suitable for the determination of trace metals, in EW-I ~ EW-III electronic grade water. The detection limit (mass score) of the method shall be less than 1 x 10-9. Flame atomic absorption spectrophotometry is suitable for the determination of trace metals in EW-IV electronic grade water.2 Normative referencesThe 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 GB/T 11446.3-2013 Generic rules for test methods of electronic grade water3 Terms and definitionsThe terms and definitions as defined in GB/T 11446.3-2013, as well as the following terms and definitions, apply to this document.4 Principles of the methodThe determination of trace metals, by atomic absorption spectrophotometry, is based on the light radiated from the light source, with the characteristic spectrum of the element to be measured, which is absorbed by the atoms of the element to be measured in the ground state in the sample vapor. The content of the elements to be measured, in the specimen, is determined by the weakening of the radiation characteristic spectrum.5 Disturbing factors5.1 The impact of reagent purity, equipment cleanliness, indoor cleanliness, contamination as caused by operation techniques, during sampling and operation, shall be strictly considered. 5.2 Water samples shall be analyzed as soon as possible. The longer the storage time, the greater the possibility of contamination. If immediate analysis is not possible, seal the sample bottle in a plastic bag; store it in the refrigerator.6 Reagents6.1 Blank water EW-I electronic grade water, which is specified in GB/T 11446.1-2013. 6.2 Nitric acid (ρ = 1.42 g/mL) MOS grade and above. 6.3 Hydrochloric acid 1+1 (volume fraction), which is prepared by the hydrochloric acid of MOS grade and above. 6.4 Standard solution Use the grade-2 standard materials, which are approved by the General Administration of Quality Supervision, Inspection and Quarantine of the People's Republic of China.7 Measuring instruments7.1 Atomic absorption spectrophotometer It includes four parts. hollow cathode lamp, atomization system-graphite furnace (or flame atomizer), spectroscopy system, detection and recording system. 7.4 Pipette 0.2 mL ~ 5.0 mL. 7.5 Polyethylene volumetric flask 25.0 mL ~ 100 mL.8 Operation procedures8.1 Selection of instrument conditions Choose the best instrument parameters (lamp current, under seam width, etc.), according to different types of instruments; see Appendix A. Refer to Appendix A, for the selection of working conditions of graphite furnace atomizer. 8.3 Drawing of working curve 8.3.1 Preparation of standard series of working solutions The standard solution is diluted, step by step, to prepare the corresponding series, as shown in Table 1.The acidity of the standard solution is consistent with the acidity of the specimen. 8.4 Determination of water samples Draw a certain amount of water sample into the graphite tube (or spray the water sample in the flame). After measuring the absorbance, find out the element content, which is corresponding to the absorbance, from the working curve.9 PrecisionThe precision of this method is as shown in Table 2.10 ReportThe 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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