This standard applies to rivers, rivers, lakes (reservoirs), seawater bodies or parts thereof for the purpose of landscape, recuperation, vacation and entertainment. GB 12941-1991 Water Quality Standard for Landscape and Recreation Water GB12941-1991 Standard download and decompression password: www.bzxz.net

National Standard of the People's Republic of China
Water quality standard for scenery and recreation area
GB12941-91
In order to implement the Water Pollution Prevention and Control Law of the People's Republic of China" and the "Marine Environmental Protection Law of the People's Republic of China", to protect and improve the water quality of landscapes and recreational water bodies, restore and maintain the natural ecosystem of their water bodies, and promote the development of tourism. This standard is specially formulated. Scope of application of the standard
This standard applies to rivers, rivers, lakes (reservoirs), seawater bodies or parts thereof for the purpose of landscape, recuperation, vacation and entertainment. 2 Classification and standard values ??of standards
2.1 Classification of standards
This standard is divided into three categories according to the different functions of water bodies: Category A: Mainly applicable to natural bathing beaches or other places in direct contact with the human body Landscape, recreational water bodies. Category B: Mainly suitable for national key scenic spots and those landscape entertainment water bodies that are not in direct contact with the human body. Category C: Mainly suitable for general landscape water bodies. 2.2 Standard values
Various water quality standard items and standard values ??are listed in Table 1. Table 1 Water Quality Standard for Landscape Recreation Water
Standard Value
Serial Number
Item
Hundred
1
2
3
5
7
8
9
10
color
membrane
floating objects| |tt||Transparency, m
Water temperature, ℃
pH value
Dissolved oxygen (DO), mg/L
Permanganate index, mg/L
Biochemical oxygen demand (BODs), mg/L
Ammonia nitrogen, mg/L
Classification approved by the State Environmental Protection Administration on 1991-03-18
Class A| |tt||No abnormal change in color
Category B
Should not contain any odor
Category C
No more than 25 chromaticity units
No obvious Abnormal smell
shall not contain floating films, oil spots and other substances that gather in nests 1.2
shall not be higher than the average water temperature of the month in the past ten years by 2℃ 2) 6.5~8.5
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6
4
0.5
4
6
4
0.5
0.5|| tt||Not higher than the past ten years
The monthly average water temperature is 4℃
3
10
8
0.5
1992-02-01 Implementation
Serial number
11
12
13
14
15
16|| tt||17
18
19
20
21
item
standard value
nonionic ammonia, mg/L
Nitrite ammonia, mg/L
Total iron, mg/L
Total copper, mg/L
Total zinc, mg/L| |tt||Total nickel, mg/L.
Total phosphorus, (calculated as P) mg/L
Volatile phenol, mg/L
Anionic surfactant, mg/
Total coliforms, individuals,
Fecal coliforms, individuals/
Classification
GB12941—91
Continued Table 1||tt| |Class A
0. 02
0.15
0.3
0.01 (Bath 0.1)
0.1 (Bath 1.0)
0. 05
0. 02
0.005
0. 2
10000
2000
Class B
0.02|| tt||0.15
0.5
0.01(seawater 0.1)
0.1(seawater 1.0)
0.05
0. 02
0.01
0. 2
class c
0.2
1.0
1.0
0.1
1.0
0.1
0.05
0. 1
0. 3
Note: 1) There is a chemical equilibrium relationship between ammonia nitrogen and non-ionic ammonia in water. When the water temperature is higher than 20℃ , when pH>8, non-ionized nitrogen must be used as an indicator to control water quality.
2) Bathing beach water temperature. Each region can stipulate items not clearly specified in this standard according to the specific local conditions. The standard values ??and values ??in GB3838§ Surface Water Environmental Quality Standard and GB3097 "Sea Water Quality Standard" shall be implemented. its relevant provisions.
3 Implementation and management of standards
3.1 Local environmental protection departments will work with relevant departments at the same level to delineate the protection scope and use types of landscapes and recreational waters. 3.2 If it is a landscape or recreational water body, the natural background value of some standard items (that is, not subject to artificial pollution) is higher than the standard value stipulated in this standard, and the original natural state should be maintained.
3.3 In the absence of accidents and interference from special natural conditions, the water quality of landscape and recreational water bodies should have more than 95% of the analyzed samples within one year complying with the provisions of this standard value.
3.4 ??The water quality of natural bathing spots in Class A waters during the swimming season should ensure that all analyzed samples meet this water quality standard. 3.5 Wastewater containing toxic and harmful pollutants is prohibited from being discharged into landscape and recreational waters. General industrial wastewater and domestic sewage are prohibited from being directly discharged into Class A and Class B waters. The wastewater must be treated to ensure that the receiving water body meets the water standards. Only under certain conditions can the water be discharged into Class C waters. 3.6 If the same water area has multiple functions, the water quality standard for the highest functional water shall be implemented. 4 Water quality monitoring
4.1 The analysis methods of each item of this standard are implemented in accordance with Table 2. The collection and storage of water samples are strictly in accordance with the relevant provisions of the "Technical Specifications for Environmental Monitoring".
4.2 The collection, storage and analysis methods of seawater samples shall be carried out in accordance with the "Marine Monitoring Specifications". For items where the analysis method is not specified, follow Table 2.
4.3. For monitoring sampling points, representative locations should be selected. The instantaneous monitoring value shall not be used as the basis for water quality judgment. In any case, sampling frequency shall not be less than once a month. The sampling rate should be appropriately increased for water bodies with signs that the water quality may deteriorate and for natural bathing water bodies during the swimming season. The increased sampling rate shall be determined by local monitoring departments based on the specific conditions of the water bodies, and the analysis results and sampling conditions shall be reported to the local environmental protection authorities. . Serial number
1
2
3
5
6
7
8
9| |tt||10
11
12
13
14
15
16
17||tt ||18
19
20
21
standard item
color
ga
floating objects||tt ||Transparency
Water temperature
pH value
Dissolved oxygen (DO)
Permanganate index
Biochemical aerobic radicals (BODs)|| tt||ammonia nitrogen
nonionic nitrogen
nitrite nitrogen
total iron
total zinc
total sales
total nickel| |tt||Total phosphorus
Volatile phenols
Anionic surfactant
Total coliforms
Fecal coliforms
GB12941-91|| tt||Table 2 Analysis methods for landscape and recreational water quality standard items Measurement methods
Platinum diamond standard colorimetric method
Text description method
Text description method
Method
Water thermometer method
Glass electrode method
Iodometric method
Acidic method
Alkaline method
Dilution and inoculation method| |tt||Nessler's reagent colorimetry
Nessler's reagent colorimetry\
spectrophotometry
phenanthroline spectrophotometry
flame atomic absorption Spectrophotometry
Disulfide Gland Spectrophotometry
Atomic Absorption Spectrophotometry
Atomic Absorption Spectrophotometry
Sodium Diethyldithiocarbamate Spectrophotometry Method 2,9-dimethyl-1,10-phenanthroline spectrophotometry flame atomic absorption spectrophotometry
ammonium molybdate spectrophotometry
distilled 4-aminoantipyrine Spectrophotometric method methylene blue spectrophotometric method
Multi-tube fermentation method
Filter membrane method
Multi-tube fermentation method
Filter membrane method
Note: 1) According to "Water and Wastewater Monitoring and Analysis Methods" third edition, China Environmental Science Press, 1989. Determination method standard number
GB11903
1)
1)
1)
1)
GB6820
GB7489
GB11892
GB7488
GB7479
GB7479
GB7493
GB5750
GB11911
GB7472|| tt||GB7475
GB7475
GB7474
GB7473
GB11912
GB11893
GB7490
GB7494||tt| | GB5750 | | tt | The percentage temperature of nonionic ammonia in aqueous ammonia solution
c
5
10
15
20
25||tt| |30
Additional notes:
6.0
0.013
0.019
0.027
0.040
0.057||tt| |0.080
6.5
0.040
0.059
0.087
0.13
0.18
0.25
7.0
0.12
0.19
0.27
0.40
0.57
0.80
This standard is proposed by the National Environmental Protection Administration. This standard is organized and formulated by the Chinese Academy of Environmental Sciences. The National Environmental Protection Administration is responsible for interpreting this standard. 7.5
0. 39
0.59
0.86
1.2
1.8
2.5
Liu Zaifang, the main drafter of this standard , Liu Heping, Yang Yanjie. pH value
8.0
1.2
1.8
2.7
3.8
5.4
7.5
8.5
3.8
5.6
8.0
11
15
20
9.0
11|| tt||16
21
28
36
45
9.5
28
37||tt| |46
56
64
72
10.0
56
65
73
80
85
89
5.| |tt||5.4
7.5
8.5
3.8
5.6
8.0
11
15||tt ||20
9.0
11
16
21
28
36
45
9.5
28
37
46
56
64
72
10.0
56| |tt||65
73
80
85
89
5.| |tt||5.4
7.5
8.5
3.8
5.6
8.0
11
15||tt ||20
9.0
11
16
21
28
36
45
9.5
28
37
46
56
64
72
10.0
56| |tt||65
73
80
85
89
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