GB/T 11913-1989 PDF English
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| Standard ID | Contents [version] | USD | STEP2 | [PDF] delivery | Name of Chinese Standard | Status |
| GB/T 11913-1989 | English | 495 |
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Water quality--Determination of dissolved oxygen--Electrochemical probe method
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GB/T 11913-1989: Water quality--Determination of dissolved oxygen--Electrochemical probe method---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/GBT11913-1989
GB
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
Water Quality - Determination of
Dissolved Oxygen - Electrochemical Probe Method
APPROVED ON. DECEMBER 25, 1989
Implemented on. JULY 01, 1990
Approved by. State Bureau of Environmental Protection
Table of Contents
1 Theme Content and Applicable Scope... 3
2 Principle... 4
3 Reagents... 4
4 Instruments... 4
5 Procedures... 5
6 Presentation of Results... 7
7 Test Report... 8
Appendix A (Addition)... 9
Water Quality - Determination of
Dissolved Oxygen - Electrochemical Probe Method
This Standard equivalently adopts the international standard ISO 5814-1984 Water
Quality – Determination of Dissolved Oxygen – Electrochemical Probe Method.
1 Theme Content and Applicable Scope
1.1 Theme content
This Standard specifies a method for measuring dissolved oxygen in water by an
electrode that separates the water sample from the electrochemical cell through a gas-
permeable membrane.
According to the different types of the used probes, the concentration of oxygen (mg/L),
or the percentage of oxygen saturation (% dissolved oxygen), or both may be
measured. This method may measure dissolved oxygen with a saturation percentage
from 0% to 100% in water. However, most instruments can measure supersaturation
values higher than 100%. This method may be used not only for determination in the
laboratory, but also for on-site determination and continuous monitoring of dissolved
oxygen. This method is suitable for the determination of water with high chromaticity
and turbidity. It is also suitable for the determination of water containing iron and
substances that can interact with iodine. All the above substances shall interfere with
the determination by iodometry. Some gases and vapors like chlorine, sulfur dioxide,
hydrogen sulfide, amine, ammonia, carbon dioxide, bromine and iodine can diffuse
and pass through the membrane. If these substances are present, they shall affect the
measured current and cause interference. The presence of other substances in the
sample shall cause the membrane blockage, membrane damage or electrode
corrosion, and further lead to interfere with the measured current. These substances
include solvents, oils, sulfides, carbonates and algae.
1.2 Scope of application
This method is applicable to natural water, sewage and salt water. If it is used to
measure salt water such as sea water or harbor water, the salt content shall be
checked.
2 Principle
The probe used in this method is composed of a small chamber in which there are two
metal electrodes and filled with electrolyte; and the small chamber is sealed by a
selective membrane. In fact, water and soluble substance ions cannot pass through
this membrane; but oxygen, certain amounts of other gases and hydrophilic
substances may pass through this membrane. The probe is immersed in water for
dissolved oxygen measurement.
3 Reagents
In the analysis process, only use recognized analytical reagents and distilled water or
water of equivalent purity.
3.1 Anhydrous sodium sulfite (Na2SO3) or sodium sulfite heptahydrate (Na2SO3 •
7H2O).
4 Instruments
4.1 Measuring instruments. It consists of the following components.
4.1.1 Measuring probe. Primary battery type (such as lead/silver) or polarographic type
(such as silver, gold);
4.3 Barometer with a scale division of 10Pa.
5 Procedures
When using the measuring instrument, the instruction manual of the manufacture shall
be followed.
5.1 Measurement technology and precautions
5.1.1 Do not touch the active surface of the membrane with hands.
5.1.3 When the probe is immersed in the sample, it shall be ensured that no air bubbles
are trapped on the membrane.
5.1.4 When the sample is in contact with the membrane of the probe, a certain flow
rate shall be maintained to prevent the dissolved oxygen in the sample at that part from
being exhausted at the moment of contact with the membrane, and generating the
false readings. It shall be ensured that the flow rate of the sample does not cause the
reading to fluctuate. In this regard, refer to the instructions of the instrument
manufacturer.
5.2 Calibration
The calibration procedures are described in 5.2.1 to 5.2.3; but the instruction manual
of the instrument manufacture must be referred.
5.2.1 Adjustment
Adjust the electrical zero point of the instrument. Some instruments have
compensation zero point, so there is no need to adjust.
5.2.4 Adjust the instrument
The probe is immersed in the bottle; and the bottle is completely filled with the sample
prepared and calibrated according to the above procedures. Allow the probe to
stabilize in the stirred solution for 10min (see 5.2.2 NOTE).
5.3 Determination
Determine the water to be tested in accordance with the manufacturer's instruction
manual.
6 Presentation of Results
6.1 The concentration of dissolved oxygen (mg/L)
The concentration of dissolved oxygen is expressed in milligrams of oxygen per liter,
taking the one digit after the decimal point.
6.2 Dissolved oxygen concentration as a function of temperature and pressure
Tables 1 and 2 give the theoretical values of dissolved oxygen concentration. Table 1
gives the values as a function of temperature at standard atmospheric pressure. Table
2 gives the values as a function of temperature and pressure.
6.3 Corrected dissolved oxygen concentration of brine samples
The solubility of oxygen in water decreases with the increase of salt content. In
practical applications, when the salt content (expressed as total salt) is below 35g/L, it
may be reasonably considered that the above relationship is linear.
6.4 Dissolved concentration expressed as saturation percentage
This is the actual dissolved oxygen concentration expressed in mg/L, which needs to
be temperature corrected if necessary
7 Test Report
The test report includes the following information.
Appendix A
(Addition)
The relationship between the solubility of oxygen in water and temperature, pressure
and salt content.
A1 Overview
The relationship between the solubility of oxygen in water and temperature and
pressure is given in the appendix.
A2 The solubility of oxygen as a function of temperature and salt content
See Table A1
......
Source: Above contents are excerpted from the full-copy PDF -- translated/reviewed by: www.ChineseStandard.net / Wayne Zheng et al.
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