Table 3 Marine water quality standard (Thailand National Environment Board)

pH

7.0–8.5

Dissolved oxygen

< 4

< 6

< 4

Salinity

Any change shall not > 10% of minimum allowable salinity

Floatable Solids

Not unpleasant

Nitrate

< 20

< 60

Chromium hexavalent

< 50

Phosphate

< 15

< 45

< 15

< 45

Turbidity

< 10% of the minimum turbidity