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Anonymous users2024-02-11Surface water environmental quality standard basic item standard limit unit: mg l serial number class.
1 Water temperature ( ) The change of anthropogenic ambient water temperature should be limited to: weekly average maximum temperature rise 1 weekly average maximum temperature drop 2
2 p h value (dimensionless) 6 - 9
3 Dissolved oxygen saturation rate 90% (or 6 5 3 24 Permanganate index 2 4 6 10 155 Chemical oxygen demand (COD) 15 15 20 30 406 5-day biochemical oxygen demand (BOD5) 3 3 4 6 107 Ammonia nitrogen (NH3-N).
8 Total phosphorus (p) lakes, reservoir lakes, reservoir lakes, reservoir lakes, reservoir lakes, reservoir lakes, reservoir lakes, reservoir lakes, reservoir lakes, reservoir
10 copper 11 zinc
12 Fluoride (as f-).
13 selenium 14 arsenic
15 Mercury 16 Cadmium
17 chromium (hexavalent).
18 Lead 19 Cyanide
20 Volatile phenols
21 Petroleum
22 Anionic surfactants
23 Sulfides
24 Fecal coliform (l) 200 2000 10000 20000 40000
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Anonymous users2024-02-10Legal Analysis: The State Stipulates the Standards for Heavy Metal Content in Drinking Water
Arsenic (mg l):
Cadmium (mg L):
Chromium (hexavalent, mg L): Hand noise.
Lead (mg L):
Mercury (mg L):
Selenium (mg L):
Cyanide (mg L):
Fluoride (mg L):
Nitrate (in n, mg l): 10
Legal basis: Food Safety Law of the People's Republic of China Article 2 Those who engage in the following activities within the territory of the People's Republic of China shall comply with this Law: (1) Food production and processing (hereinafter referred to as food production), food sales and catering services (hereinafter referred to as food business); 2) production and operation of food additives; (3) The production and operation of packaging materials, containers, detergents, disinfectants used in food production and operation, and tools and equipment used in food production and operation (hereinafter referred to as "food-related products"); (4) The use of food additives and food-related products by food producers and traders; (5) storage and transportation of food; (6) Safety management of food, food additives, and food-related products.
The quality and safety management of primary products derived from agriculture (hereinafter referred to as edible agricultural products) for consumption shall comply with the provisions of the Law of the People's Republic of China on the Quality and Safety of Agricultural Products. However, the provisions of this Law shall be complied with in the market sale of edible agricultural products, the formulation of relevant quality and safety standards, the publication of relevant safety information, and the provisions of this Law on agricultural inputs.
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Anonymous users2024-02-09Hello, cadmium (CD) in drinking water is a very harmful substance, which can accumulate in the human body and cause very serious harm to health. In general, the standard for cadmium in drinking water is milligrams. If the cadmium level of drinking water exceeds the standard by 6 times and the cadmium content is milligrams, it does not meet the national health standards and cannot be directly drunk.
If you drink this kind of water for a long time, it will cause great harm to the liver, kidneys, bones and central nervous system and other organs of the human body, and even endanger life. If the drinking water in your home exceeds the standard, it is recommended to stop drinking it immediately and consult the relevant local authorities or professional institutions for testing and treatment.
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Anonymous users2024-02-08The state stipulates the standards for the content of heavy metals in drinking water
Arsenic (mg l):
Cadmium (mg L):
Chromium (hexavalent, mg l):
Lead (mg L):
Mercury (mg L):
Selenium (mg L):
Cyanide (mg L):
Fluoride (mg L):
Nitrate (in n, mg l): 10
Legal basis: Food Safety Law of the People's Republic of China Article 2 Those who engage in the following activities within the territory of the People's Republic of China shall comply with this Law: (1) Food production and processing (hereinafter referred to as food production), food sales and catering services (hereinafter referred to as food business); 2) production and operation of food additives; (3) The production and operation of packaging materials, containers, detergents, disinfectants used in food production and operation, and tools and equipment used in food production and operation (hereinafter referred to as "food-related products"); (4) The use of food additives and food-related products by food producers and traders; (5) storage and transportation of food; (6) Safety management of food, food additives, and food-related products.
The quality and safety management of primary products derived from agriculture (hereinafter referred to as edible agricultural products) for consumption shall comply with the provisions of the Law of the People's Republic of China on the Quality and Safety of Agricultural Products. However, the provisions of this Law shall be complied with in the market sales of edible agricultural potato and celery products, the formulation of relevant quality and safety standards, the publication of relevant safety information, and the provisions of this Law on agricultural inputs.
Seawater is the "home" of salt, and seawater contains various salts, about 90% of which are sodium chloride, that is, table salt. In addition, it also contains magnesium chloride, magnesium sulfate, magnesium carbonate and other salts containing potassium, iodine, sodium, bromine and other elements. Where does so much salt come from in the sea? >>>More
When the speed of oxygen into the water is equal to the speed of oxygen in the water, that is, an equilibrium is reached, under certain conditions, when the oxygen dissolves in the water to reach equilibrium, the content of dissolved oxygen in a certain volume of water is called solubility, and the solubility of oxygen in water is affected by the water temperature, the salt content in the water, and the partial pressure of oxygen. >>>More
Normally, it is divided into several proportions, 70%, 50%, and the above is called silver welding; 30% is commonly known as low welding, and the corresponding numbers indicate the silver content, but in practice, failure to meet this standard is fraud.
The meaning of love listen, obligate, valued, xcuse, this is the true meaning of love, when you really love someone, you will give willingly.
People can't live without water, but drinking too much water can also cause poisoning. This view may be unfamiliar, but in fact, cases of water poisoning caused by large amounts of water drinking have been reported in the United States as early as the 30s. Later, the United Kingdom, Canada, Germany and other countries successively reported some cases of poisoning due to excessive drinking water. >>>More