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GB/T 6682-2008 PDF in English


GB/T 6682-2008 (GB/T6682-2008, GBT 6682-2008, GBT6682-2008)
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GB/T 6682-2008: PDF in English (GBT 6682-2008)

GB/T 6682-2008
GB
ICS 71.040.30
G 60
NATIONAL STANDARD OF THE
PEOPLE'S REPUBLIC OF CHINA
Replacing GB/T 6682-1992
Water for Analytical Laboratory Use -
Specification and Test Methods
ISSUED ON. MAY 15, 2008
IMPLEMENTED ON. NOVEMBER 1, 2008
Issued by. General Administration of Quality Supervision, Inspection and
Quarantine of the People's Republic of China;
Standardization Administration of the People's Republic of
China.
Table of Contents
Foreword ... 3 
1 Scope ... 4 
2 Normative references ... 4 
3 Appearance ... 4 
4 Level ... 5 
5 Specification ... 5 
6 Sampling and Storage ... 6 
7 Test Methods ... 7 
8 Test Report ... 11 
Annex A ... 12 
Annex B... 13 
Foreword
This Standard is modified in relation to ISO 3696.1987 "Water for Analytical
Laboratory Use - Specification and Test Methods" (English edition).
This Standard was modified during the adoption of ISO 3696. 1987, in consideration
of the national conditions of China. Those technical differences have already been
incorporated into the text and marked with perpendicular single line on the margin of
relevant clauses. Comparison Between chapter and article numbers of this Standard
and ISO 3696.1987 is listed in Annex A. Technical differences and reasons between
this Standard and ISO 3696.1987 is listed in Annex B for reference.
This Standard replaces "Water for Analytical Laboratory Use - Specification and Test
Methods" GB/T 6682 - 1992. Compared with GB/T 6682 - 1992, this Standard has the
following main changes.
- ADD the test report (Chapter 8 of this edition).
Annex C of this Standard is normative; Annex A and Annex B are informative.
This Standard is proposed by China Petroleum and Chemical Industry Association.
This Standard is under the jurisdiction of Chemical Reagent Subcommittee of
National Technical Committee on Chemical of Standardization Administration of China
(SAC/TC 63/SC 3).
Drafting organization of this Standard. Sinopharm Chemical Reagent Co., Ltd.
Main drafters of this Standard. Chen Haoyun, Chen Hong.
This Standard was issued in 1686 for the first time and revised in 1992 for the first
time.
Water for Analytical Laboratory Use -
Specification and Test Methods
1 Scope
This Standard specifies the level, specification, sampling and storage, test methods
and test report of water for analytical laboratory use.
This Standard is applicable to the water for chemical analysis and inorganic trace
analysis tests. Water of different levels may be selected according to the requirements
of actual work.
2 Normative references
The provisions in following documents become the provisions of this Standard
through reference in this Standard. For dated references, the subsequent
amendments (excluding corrigendum) or revisions do not apply to this Standard,
however, parties who reach an agreement based on this Standard are encouraged to
study if the latest versions of these documents are applicable. For undated references,
the latest edition of the referenced document applies.
GB/T 601 Chemical reagent - Preparations of standard volumetric solutions
GB/T 602 Chemical reagent - Preparations of standard solutions for impurity
(GB/T 602-2002, ISO 6353-1.1982, NEQ)
GB/T 603 Chemical reagent - Preparations of reagent solutions for use in test
methods (GB/T 603-2002, ISO 6353-1.1982, NEQ)
GB/T 9721 Chemical reagent - General rules for the molecular absorption
spectrophotometry (ultraviolet and visible)
GB/T 9724 Chemical reagent - General rule for the determination of pH (GB/T
9724-2007, ISO 6353-1.1982, NEQ)
GB/T 9740 Chemical reagent - General method for the determination of dry
residue after evaporation (GB/T 9740-2008, ISO 6353-1.1982, NEQ)
3 Appearance
Water for analytical laboratory use shall be colorless, transparent liquid through visual
observation.
4 Level
Raw water for analytical laboratory use shall be drinking water or water in proper
purity.
Water for analytical laboratory use is classified into three levels. level 1 water, level 2
water and level 3 water.
4.1 Level 1 water
Level 1 water is used for the analytical test with strict requirements, including the test
with requirements for particles, such as water for high performance liquid
chromatography analysis.
Level 1 water may be prepared by level 2 water after distilled by quartz equipment or
treated by ion exchange mixed bed, and then filtered through 0.2μm microporous
filtering film.
4.2 Level 2 water
Level 2 water is used for inorganic trace analysis test, such as water for atomic
absorption spectroscopy.
Level 2 water may be prepared by such methods as several distillation or ion
exchange.
4.3 Level 3 water
Level 3 water is used for general chemical analysis test.
Level 3 water may be prepared by such methods as distillation or ion exchange.
5 Specification
Specification of water for analytical laboratory use is detailed in Table 1.
6.3 Storage
During the storage period of water at various levels, the main contamination sources
are soluble constituent of container, carbon dioxide in the air and other impurities.
Therefore, level 1 water shall not be stored, but prepared before application. Level 2
water and level 3 water may be prepared in the right amount. They shall be
respectively stored in the corresponding containers washed with water of the same
level in advance.
Water at various levels shall be prevented from being contaminated during the
transportation process.
7 Test Methods
In the test methods, each test shall be carried out in the clean environment and
adequate measures shall be taken to prevent the sample from being contaminated.
Water sample shall be measured out to the accuracy of 0.1mL; adopted solution
represented by "%" is mass fraction.
Analytical reagent and water of corresponding level shall be used in the test.
7.1 pH value
100mL of water sample shall be measured out and determined according to the
requirements of GB/T 9724.
7.2 Conductivity
7.2.1 Instrument
7.2.1.1 Conductivity meter for level 1 and level 2 water determination. equipped with
"online" conductivity cell with 0.01cm-1~0.1cm-1 electrode constant, have temperature
automatic compensation function.
In the case of conductivity meter without temperature compensation function, "online"
heat exchanger may be installed to control the water temperature 25°C±1°C in the
determination; or water temperature may be recorded and reduced according to
Annex C.
7.2.1.2 Conductivity meter for level 3 water determination. equipped with conductivity
cell with 0.1cm-1~1cm-1 electrode constant, have temperature automatic
compensation function.
In the case of conductivity meter without temperature compensation function,
thermostatic water-bath groove may be installed to control the to-be-measured water
7.4.1 Instrument conditions
Quartz absorption cell. thickness of 1cm and 2cm.
7.4.2 Determination procedures
Respectively POUR the water sample into 1cm and 2cm absorption cells, USE the
water sample in 1cm absorption cell as reference at 254nm, DETERMINE the
absorbance of water sample in 2cm absorption cell.
If the sensitivity of instrument is insufficient, the thickness of measurement absorption
cell may be added properly.
7.5 Evaporation residue
7.5.1 Instrument
7.5.1.1 Rotary evaporator. equipped with 500mL distillation flask.
7.5.1.2 Thermostatic water-bath.
7.5.1.3 Evaporation pan. the materials may be platinum, quartz and borosilicate glass.
7.5.1.4 Electric oven. temperature may be controlled between 105°C±2°C.
7.5.2 Determination procedures
7.5.2.1 Water sample pre-contraction
MEASURE out 1000mL of level 2 water (500mL of level 3 water), ADD the water
sample into the distillation flask of rotary evaporator in several times, CARRY out
reduced pressure evaporation on the water bath (avoiding evaporate to dryness),
SYOP heating until the water sample is evaporated to 50mL.
7.5.2.2 Determination
TRANSFER the above pre-contraction water sample INTO a evaporation pan
constant volume at 105°C±2°C, RINSE the distillation flask with 5mL~10mL of water
sample for twice, COMBINE the washing liquid and pre-contraction water sample into
a evaporation pan, DETERMINE according to the requirements of GB/T 9740.
7.6 Soluble silicon
7.6.1 Reagent preparation
7.6.1.1 Silicon dioxide standard solution (1mg/mL)
It shall be prepared according to the requirements of GB/T 602.
The preparation of standard colorimetric solution. TAKE 0.50 mL of silicon dioxide
standard solution (0.01mg/mL), DILUTE to 20mL with water sample, treat meanwhile
and likewise with the test solution of the same v...
......
 
Source: Above contents are excerpted from the PDF -- translated/reviewed by: www.chinesestandard.net / Wayne Zheng et al.