The new standard sets requirements for the concentration of antimony and nitrite nitrogen, removes zinc limits, and raises arsenic, manganese, and boron.
element | before | after |
antimony | — | ≤0.005mg/L |
nitrite nitrogen | — | ≤0.04mg/L |
zinc | ≤ 5mg/L | — |
arsenic | ≤0.05mg/L | ≤0.01mg/L |
manganese | ≤2mg/L | ≤0.4mg/L |
boron | ≤30mg/L | ≤5mg/L |
It also remove requirements for the hardness of water and iron concentration in the production section.