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HJ637-2018

Chinese Standard: 'HJ637-2018'
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HJ 637-2018English225 Add to Cart 0--15 minutes. Auto immediate delivery. Water quality - Determination of petroleum, animal fats and vegetable oils - Infrared spectrophotometry Valid HJ 637-2018
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HJ 637-2018
HJ
ENVIRONMENTAL PROTECTION STANDARD
OF THE PEOPLE’S REPUBLIC OF CHINA
Replacing HJ 637-2012
Water quality - Determination of petroleum, animal fats
and vegetable oils - Infrared spectrophotometry
水质 石油类和动植物油类的测定
红外分光光度法
ISSUED ON. OCTOBER 10, 2018
IMPLEMENTED ON. JANUARY 01, 2019
Issued by. Ministry of Ecological Environment
Table of Contents
Foreword ... 3 
1 Scope ... 5 
2 Normative references ... 5 
3 Terms and definitions ... 5 
4 Principle of method ... 6 
5 Reagents and materials ... 6 
6 Instruments and equipment... 8 
7 Samples ... 9 
8 Analytical procedures ... 10 
9 Calculation and representation of results ... 12 
10 Precision and accuracy ... 14 
11 Quality assurance and quality control... 14 
12 Waste disposal ... 15 
13 Precautions ... 15 
Water quality - Determination of petroleum, animal fats
and vegetable oils - Infrared spectrophotometry
Warning. The tetrachloroethylene used in the experiment is harmful to
human health. The preparation of standard solution, the preparation of
sample, the determination process shall be carried out in a fume hood.
During operation, it shall wear protective equipment as required to avoid
contact with skin and clothing.
1 Scope
This standard specifies the infrared spectrophotometric method for the
determination of petroleum, animal fats and vegetable oils in water.
This standard applies to the determination of petroleum, animal fats and
vegetable oils in industrial and domestic sewage.
When the volume of sample is 500 ml, the volume of the extract is 50 ml, the 4
cm quartz cuvette is used, the detection limit of method is 0.06 mg/L, the lower
limit of determination is 0.24 mg/L.
2 Normative references
The contents of this standard refer to the following documents or their terms.
For undated references, the valid version applies to this standard.
HJ/T 91 Technical specifications requirements for monitoring of surface
water and waste water
3 Terms and definitions
The following terms and definitions apply to this standard.
3.1
Oil and grease
It refers to, under the conditions of pH ≤ 2, the substances that can be
extracted by tetrachloroethylene and have characteristic absorption at
wavenumbers of 2930 cm-1, 2960 cm-1, 3030 cm-1, mainly including
petroleum, animal fats and vegetable oils.
5.4 n-hexadecane (C16H34). Chromatographical pure.
5.5 Isooctane (C8H18). Chromatographical pure.
5.6 Benzene (C6H6). Chromatographical pure.
5.7 Anhydrous sodium sulfate (Na2SO4).
PLACE it in a muffle furnace to heat it at 550 °C for 4 h. After it is slightly cooled,
CONTAIN it into a ground glass bottle. PLACE it in a desiccator for storage.
5.8 Magnesium silicate (MgSiO3). 150 μm ~ 250 μm (100 mesh ~ 60 mesh).
TAKE magnesium silicate and PLACE it in a porcelain evaporating dish. PLACE
it in a muffle furnace at 550 °C to heat it for 4 h. After it is slightly cooled,
TRANSFER it into a desiccator to cool it to room temperature. WEIGH an
appropriate amount of magnesium silicate in a ground glass bottle. According
to the mass of magnesium silicate, ADD an appropriate amount of distilled
water in a ratio of 6% (m/m). CAP it tightly and SHAKE it thoroughly. LET it be
standing for 12 h before use. PRESERVE it in a glass bottle.
5.9 Glass wool
Before use, USE the tetrachloroethylene (5.3) to soak and rinse the glass wool.
DRY it naturally to prepare for use.
5.10 Standard stock solution of n-hexadecane. ρ≈10000 mg/L.
WEIGH 1.0 g (accurate to 0.1 mg) of n-hexadecane (5.4) in a 100 ml volumetric
flask. USE tetrachloroethylene (5.3) to make its volume reach to the mark.
SHAKE it uniformly. STORE it at 0 °C ~ 4 °C, which can be preserved in the
dark for 1 year.
5.11 Standard use solution of n-hexadecane. ρ = 1000 mg/L.
USE tetrachloroethylene (5.3) to dilute the standard stock solution of n-
hexadecane (5.10) to the volume in a 100 ml volumetric flask.
5.12 Standard stock solution of isooctane. ρ≈10000 mg/L.
WEIGH 1.0 g (accurate to 0.1 mg) of isooctane (5.5) in a 100 ml volumetric
flask. USE tetrachloroethylene (5.3) to make its volume reach to the mark.
SHAKE it uniformly. STORE it at 0 °C ~ 4 °C, which can be preserved in the
dark for 1 year.
5.13 Standard use solution of isooctane. ρ = 1000 mg/L.
USE tetrachloroethylene (5.3) to dilute the standard stock solution of isooctane
(5.12) to the volume in a 100 ml volumetric flask.
6.6 Colorimetric tube. 25 ml, 50 ml, grou......
Related standard:   HJ 636-2012  HJ 970-2018
   
 
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