HJ 593-2010 (HJ593-2010)

Standard ID	Contents [version]	USD	STEP2	[PDF] delivered in	Standard Title (Description)	Related Standard	Status	PDF
HJ 593-2010	English	239	Add to Cart	3 days [Need to translate]	Water quality. Determination of phosphorus. Phosphomolybdenum blue spectrophotometric method	HJ 593-2010	Valid	HJ 593-2010

HJ 593-2010
Water quality.Determination of phosphorus.Phosphomolybdenum blue spectrophotometric method
National Environmental Protection Standard of the People's Republic
Water quality - Determination of phosphorus - Molybdenum blue spectrophotometric method
(temporary)
Water quality-Determination of phosphorus-phosphomolybdenum blue
Spectrophotometric method
Released on.2010-10-21
2011-01-01 implementation
Ministry of Environmental Protection released
I directory
Foreword. II
1 Scope.1
2 Normative references.1
3 principle of the method.1
4 Interference and elimination 1
5 reagents and materials 1
6 Instruments and equipment 3
7 sample 3
8 Analysis steps.3
9 result calculation.4
10 Notes.5
Foreword
In order to implement the "Environmental Protection Law of the People's Republic of China" and the "Water Pollution Prevention and Control Law of the People's Republic of China"
The body health, standardize the determination method of elemental phosphorus in water, and develop this standard.
This standard specifies the phosphorus molybdenum blue spectrophotometric method for the determination of elemental phosphorus in water.
This standard was formulated by the Science and Technology Standards Department of the Ministry of Environmental Protection.
This standard is mainly drafted by. Beijing Environmental Protection Monitoring Center.
This standard was approved by the Ministry of Environmental Protection on October 21,.2010.
This standard has been implemented since January 1,.2011.
This standard is explained by the Ministry of Environmental Protection.
1Water quality - Determination of phosphorus - Molybdenum blue spectrophotometric method
Warning. Toluene is toxic, perchloric acid, potassium bromate-potassium bromide solution is corrosive, and the mixture of perchloric acid and organic matter may explode when heated.
Operation must be carried out in a fume hood, the operator must be careful
1 Scope of application
This standard specifies the phosphorus molybdenum blue spectrophotometric method for the determination of elemental phosphorus in water.
This standard applies to the determination of elemental phosphorus in surface water, groundwater, industrial wastewater and domestic sewage.
When the sampling volume is 100ml, the detection limit of the direct colorimetric method is 0.003mg/L, and the lower limit of determination is 0.010 mg/L.
The upper limit of the measurement was 0.170 mg/L.
2 Normative references
The contents of this standard refer to the following documents or their terms. For undated references, the valid version is appropriate.
Used in this standard.
GB/T 6682 Analytical laboratory water specifications and test methods
3 Principle of the method
The toluene is used as an extractant to extract elemental phosphorus from the water sample. The extract is oxidized into elemental phosphorus by potassium bromate-potassium bromide solution.
Orthophosphate, under acidic conditions, the phosphomolybdate heteropoly acid formed by the reaction of orthophosphate with ammonium molybdate is reduced by the reducing agent stannous chloride
To a blue complex, the absorbance is proportional to the content of elemental phosphorus, and the absorbance is measured by a spectrophotometer to calculate the elemental phosphorus.
The content.
When the content of elemental phosphorus in water is less than 0.05mg/L, the coloration determination after enrichment with butyl acetate can reduce the dryness.
Disturbance, improve sensitivity and reliability of detection.
4 interference and elimination
When the amount of arsenide, silicide and sulfide in the water sample is 100 times,.200 times and 300 times of the elemental phosphorus content, respectively,
There is no significant interference with this method.
5 reagents and materials
Unless otherwise stated, analytically pure reagents that meet national standards were used for the analysis. The test water is in accordance with GB/T 6682.
Three levels.
5.1 Toluene. ρ (C7H8) = 0.867 g/ml, excellent grade pure.
5.2 Hydrochloric acid. ρ (HCl) = 1.19g/ml, excellent grade pure.
25.3 Perchloric aci