GB/T 11446.5-2013 PDF in English
GB/T 11446.5-2013 (GB/T11446.5-2013, GBT 11446.5-2013, GBT11446.5-2013)
| Standard ID | Contents [version] | USD | STEP2 | [PDF] delivered in | Name of Chinese Standard | Status |
| GB/T 11446.5-2013 | English | 160 |
Add to Cart
|
0-9 seconds. Auto-delivery.
|
Test method for measuring trace metals in electronic grade water by atomic absorption spectrophotometry
| Valid |
| GB/T 11446.5-1997 | English | 199 |
Add to Cart
|
2 days
|
Test method for measuring trace metals in electronic grade water by atomic absorption spectrophotometry
| Obsolete |
| GB 11446.5-1989 | English | 239 |
Add to Cart
|
2 days
|
Test method for measuring trace metals in electronic grade water by atomic absorption spectrophotometry
| Obsolete |
Standards related to (historical): GB/T 11446.5-2013
PDF Preview
GB/T 11446.5-2013: PDF in English (GBT 11446.5-2013) GB/T 11446.5-2013
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
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.
3.1
Atomic absorption spectrophotometry
An analytical method, for determining the content of the element to be
measured in a sample, based on the absorption of light of characteristic
wavelength by the ground state atoms.
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.
Use a flameless (or flame) atomic absorption spectrophotometer, at 324.7 nm,
213.9 nm, 232.0 nm, 248.3 nm, 217.0 nm, 589.0 nm, 766.5 nm and other
wavelengths, to measure the absorbance of copper, zinc, nickel, iron, lead,
sodium, potassium and other metal elements, in the water sample to be tested.
Then check the content of the element to be measured, which is corresponding
to each absorbance, from the standard curve.
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. The measurement shall be performed, in
a clean room of grade 100. The graphite furnace must be burnt to zero reading,
before each sample addition; meanwhile a blank test shall be performed. After
a certain number of samples are measured, it shall analyze a standard sample,
to monitor these disturbances.
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. The standard substances GBW (E), for water
composition analysis, are copper (080122), zinc (080130), nickel (080141),
sodium (080127), potassium (080125), GBW iron (08616), lead (08619); OR it
may be the BW series water quality standard solution, which is provided by the
National Standard Material Research Center.
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.
7.2 Sample injector
Autosampler or micro sampler, sprayer for flame atomization.
7.3 Polyethylene bottle
25 mL, 50 mL, 100 mL.
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.
8.2 Injection volume
......
Source: Above contents are excerpted from the PDF -- translated/reviewed by: www.chinesestandard.net / Wayne Zheng et al.
|