GB/T 11446.5-2013 PDF English
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| Standard ID | Contents [version] | USD | STEP2 | [PDF] delivery | Name of Chinese Standard | Status |
| GB/T 11446.5-2013 | English | 160 |
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Test method for measuring trace metals in electronic grade water by atomic absorption spectrophotometry
| Valid |
| GB/T 11446.5-1997 | English | 199 |
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Test method for measuring trace metals in electronic grade water by atomic absorption spectrophotometry
| Obsolete |
| GB 11446.5-1989 | English | 239 |
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Test method for measuring trace metals in electronic grade water by atomic absorption spectrophotometry
| Obsolete |
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GB/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 Contents
Foreword... 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... 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 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 spectrophotometry
1 Scope
This 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 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
GB/T 11446.3-2013 Generic rules for test methods of 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, apply to this document.
4 Principles of the method
The 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 factors
5.1 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 Reagents
6.1 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 instruments
7.1 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 procedures
8.1 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 Precision
The precision of this method is as shown in Table 2.
10 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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