Environmental standard (water pollution: sea area) about maintenance of living environment 2

There is sea area and, in this page, speaks among separate table 2 (environmental standard about maintenance of living environment) of the Environmental Agency notification that determined environmental standard of water pollution based on Environmental Basic Law. In addition, environmental standard of this sea area is divided into table 2 of (a) which described five items such as pH except (i) and total phosphorus which described all nitrogen causing eutrophication and total phosphorus and total phosphorus.

Last update date March 12, 2019

pH

A
Item	Adaptability of the use purpose	The standard value					Applicable area of the sea
Type		Hydrogen ion Density (pH)	Chemical Oxygen demand (COD)	Oxygen content of water (DO)	The number of the coliform bacteria	n-hexane Extraction material (oil content)
A	The fisheries first grade Bath Natural environments maintenance And column which is lower than B We advocate in this	7.8 The above 8.3 The following	2 mg/l or less	7.5 mg/l or more	1,000MPN/ 100 ml or less	Do not be detected	Area of the sea to appoint for each topology of water regions by 2 first (2)
B	The fisheries second grade Water for industrial use And column which is lower than C We advocate in this	7.8 The above 8.3 The following	3 mg/l or less	5 mg/l or less	－	Do not be detected
C	Environmental conservation	7.0 The above 8.3 The following	8 mg/l or less	2 mg/l or more	－	－
Method for measurement		Method to fix for standard 12.1 or method to be provided of measurement result at the same level as this by the quality of the water automatic monitoring measurement device using glass electrode	Method (law but alkaline among water for industrial use of B type and the fisheries second grade as for the method for measurement in irrigation point of paste culture) to fix for standard 17	Method to fix for standard 32 or method to be provided of measurement result at the same level as this by the quality of the water automatic measurement device using diaphragm electrode	Assay by itokakusuu	Method to advocate in appended chart 9
Remarks Among 1 fisheries first grade, it is said that it is number of the coliform bacteria 70MPN/100ml or less about irrigation point of raw materials oyster culture for eating raw. 2 alkalinity method is next. We take kensui 50 ml to conical flask exactly and leave unattended during boiling bath exactly for 20 minutes after adding 1 ml of sodium hydroxide solution (10w/v%), and having added 10 ml of N/100 potassium permanganate solution exactly next. Afterwards, we add 1 ml of potassium solution (10w/v%) iodide and sodium azide solution (4w/v%) one drop and, after the cooling, let ka eteyo so isolate with 0.5 ml of sulfuric acid (2+1) and titrate starch solution as indicator with N/100 sodium thiosulfate solution becoming clear of titer in that. We demand the sky examination level that we handled equally using distilled water in substitution for sample at the same time and calculate COD level by the next expression. 1000/50 COD (O2mg/l) = 0.08 X ((b)-(a)) X fNa2S2O3 X (a) : Titration level (ml) of N/100 sodium thiosulfate solution (b) : Sky examination level (ml) that followed distilled water fNa2S2O3 ： Titer of N/100 sodium thiosulfate solution

(note) 1 natural environments maintenance ： Environmental conservation such as natural sight-seeing
2 fisheries first grade ： The one for for red seabream, yellowtail, fisheries living things such as seaweed and fisheries living thing of the fisheries second grade
The fisheries second grade ： The one for fisheries living things such as striped mullet, paste
3 environmental conservation ： Everyday life (we include strolls of the coast.) of the nation Limit to put in this, and not to produce discomfort

i
Item	Adaptability of the use purpose	The standard value		Applicable area of the sea
		All nitrogen	Total phosphorus
I	Natural environments maintenance And we advocate in column which is lower than II (two kinds of fisheries and three kinds are excluded.)	0.2 mg/l or less	0.02 mg/l or less	Area of the sea to appoint for each topology of water regions by 2 first (2)
II	One kind of fisheries Bath And we advocate in column which is lower than III (two kinds of fisheries and three kinds are excluded.)	0.3 mg/l or less	0.03 mg/l or less
III	Two kinds of fisheries and We advocate in column of IV	0.6 mg/l or less	0.05 mg/l or less
IV	Three kinds of fisheries Water for industrial use Agriculture water Living thing biotope maintenance	1 mg/l or less	0.09 mg/l or less
Method for measurement		Method to fix for standard 45.4	Method to fix for standard 46.3
Remarks 1 standard value assumes the annual mean. We shall perform designation of 2 topology of water regions about sea area that might produce remarkable increase of marine phytoplankton.

(note) 1 natural environments maintenance ： Environmental conservation such as natural sight-seeing
One kind of 2 fisheries ： A variety of fisheries living things are in a good balance and stably fished including bottom raw seafood
Two kinds of fisheries ： Except some bottoms straight fishery products, it is played takaku fisheries living thing mainly on fish
Three kinds of fisheries ： Specific fisheries living thing resisting contamination is fished mainly
3 living thing biotope maintenance ： Limit that benthos can inhabit through the year

※ It becomes the other page about provisional aim (2004) of all nitrogen and total phosphorus.

※ Environmental standard about river and wetlands becomes the other page.

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