GB/T 6682-2008 PDF English
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| Standard ID | Contents [version] | USD | STEP2 | [PDF] delivery | Name of Chinese Standard | Status |
| GB/T 6682-2008 | English | 70 |
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Water for analytical laboratory use -- Specification and test methods
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| GB/T 6682-1992 | English | 70 |
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Water for analytical laboratory use--Specification and test methods
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GB/T 6682-2008: Water for analytical laboratory use -- Specification and test methods---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/GBT6682-2008
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 Classification... 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 grade, 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 grades 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 and clear liquid through visual
observation.
4 Classification
Raw water for analytical laboratory use shall be drinking water or water in proper
purity.
4.1 Grade 1 water
Grade 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.
4.2 Grade 2 water
Grade 2 water is used for inorganic trace analysis test, such as water for atomic
absorption spectroscopy.
4.3 Grade 3 water
Grade 3 water is used for general chemical analysis test.
5 Specification
Specification of water for analytical laboratory use is detailed in Table 1.
6 Sampling and Storage
6.1 Container
6.1.1 Water of various grades shall be held in closed and special polyethylene
container. Grade 3 water may be held in closed and special glass container.
6.1.2 New container shall be processed before application through soaking for 2d~3d
with hydrochloric acid solution (mass fraction 20%), repeatedly washing with
to-be-measured water, and filling in to-be-measured water and soaking more than 6h.
6.2 Sampling
In the case of testing according to this standard, at least 3L of representative water
sample shall be taken.
Before sampling, the container shall be washed repeatedly with to-be-measured
water; during sampling, the container shall be prevented from being contaminated.
The container shall be full of water sample.
6.3 Storage
During the storage period of water at various grades, the main contamination sources
are soluble constituent of container, carbon dioxide in the air and other impurities.
Therefore, grade 1 water shall not be stored, but prepared before application.
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 to the accuracy of 0.1mL; adopted solution
represented by "%" is mass fraction.
Analytical reagent and water of corresponding grade 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
7.2.2 Determination procedures
7.2.2.1 Install and trial the instrument according to the instructions of conductivity meter.
7.2.2.2 Grade 1 and grade 2 water measurement. install the conductivity cell at the
flow water outlet of water treatment unit, adjust the water rate, expel the gas bubble in
the pipe and conductivity cell, and then start measurement.
7.2.2.3 Grade 3 water measurement. TAKE 400mL of water sample to a conical flask,
INSERT conductivity cell, and then start measurement.
7.2.3 Precautions
Conductivity meter and conductivity cell for measurement shall be calibrated regularly.
7.3 Oxidable substance
7.3.1 Reagent preparation
7.3.1.1 Sulfuric acid solution (20%)
It shall be prepared according to the requirements of GB/T 603.
7.4 Absorbance
It shall be measured according to the requirements of GB/T 9721.
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 dish. 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 grade 2 water (500mL of grade 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),
STOP heating until the water sample is evaporated to 50mL.
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.
7.6.1.2 Silicon dioxide standard solution (0.01mg/mL)
MEASURE out 1.00mL of silicon dioxide standard solution (1mg/mL) into a 100mL
volumetric flask, DILUTE to the scale, SHAKE up, TRANSFER to a polyethylene
bottle, and prepare when needing.
7.6.1.5 Sulfuric acid solution (20%)
It shall be prepared according to the requirements of GB/T 603.
7.6.1.6 Oxalic acid solution (50g/L)
WEIGH out 5.0g of oxalic acid, DISSOLVE it in water, DILUTE to 100mL, STORE in a
polyethylene bottle.
7.6.2 Instruments
7.6.3 Determination procedures
MEASURE out 520mL of grade 1 water (270mL of grade 2 water), POUR into a
platinum dish, CARRY out sub-boiling evaporation to about 20mL under the
dust-proof conditions, STOP heating, COOL down to the room temperature, ADD
1.0mL of ammonium molybdate solution (50g/L), SHAKE up, PLACE for 5 minutes,
ADD 1.
8 Test Report
Test report shall include the following contents.
a) Sample determination;
b) Referenced adopted method;
c) Results and representation methods;
d) Abnormal phenomena description in the determination;
e) Any operation not included in this Standard.
......
Source: Above contents are excerpted from the full-copy PDF -- translated/reviewed by: www.ChineseStandard.net / Wayne Zheng et al.
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