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Environmental standard (water pollution: sea area) about maintenance of living environment 1999

Last update date March 12, 2019

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.

Environmental standard about maintenance of separate table 2 living environment

1 sea area

A
ItemAdaptability of the use purposeThe standard valueApplicable area of the sea
Type Hydrogen ion
Density
(pH)
Chemical
Oxygen demand
(COD)
Oxygen content of water
(DO)
The number of the coliform bacterian-hexane
Extract room
(oil content)
 
AThe 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 less7.5 mg/l or more1,000MPN/
100 ml or less
Do not be detectedArea of the sea to appoint for each topology of water regions by 2 first (2)
BThe 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 less5 mg/l or lessDo not be detected
CEnvironmental conservation7.0 The above
8.3 The following
8 mg/l or less2 mg/l or more
Method for measurementMethod 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 electrodeMethod (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 17Method 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 electrodeAssay by itokakusuuMethod 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 purposeThe standard valueApplicable area of the sea
Type All nitrogenTotal phosphorus 
INatural 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 less0.02 mg/l or lessArea of the sea to appoint for each topology of water regions by 2 first (2)
IIOne 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 less0.03 mg/l or less
IIITwo kinds of fisheries and
We advocate in column of IV
0.6 mg/l or less0.05 mg/l or less
IVThree kinds of fisheries
Water for industrial use
Agriculture water
Living thing biotope maintenance
1 mg/l or less0.09 mg/l or less
Method for measurementMethod to fix for standard 45.4Method 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

About all nitrogen, provisional aim (1999) of total phosphorus

Of topology of water regions of environmental standard to modify area of the sea affecting environmental standard and area of the sea to raise at cabinet ordinance separate table about commission of local designated authority appoint (extract)

The achievement period
The area of the sea namePertinence
Type
The achievement periodProvisional aim
(1999)
Tokyo Bay (ro)IVWhile achieving provisional aim progressively,
We try for the prompt achievement of environmental standard as possible.
All 1.4 mg/l of nitrogen
0.095 mg/l of total phosphorus
Tokyo Bay (ni)IIIWhile achieving provisional aim progressively,
We try for the prompt achievement of environmental standard as possible.
All 0.97 mg/l of nitrogen
0.067 mg/l of total phosphorus
(note 1) About applicable type, we cope with type of environmental standard to modify all nitrogen of sea area shown in the next figure and total phosphorus.
(note 2) This provisional aim is applied to result of a measurement until 1999 (Heisei 11).

Area of the sea division of environmental standard to affect all nitrogen, total phosphorus

Figure of area of the sea division of environmental standard to affect all nitrogen, total phosphorus

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

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