황산 폐수의 배출 pH 값이 5.9라면 기준을 충족하는 것으로 볼 수 있나요?
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황산 폐수의 배출 pH 값이 5.9라면 기준을 충족하는 것으로 볼 수 있나요?
이건 잘 모르겠는데, 보통은 알칼리성이어야 하지 않을까요? pH=9 이상이면 될 것 같아요
6에서 9가 되어야 해, 조금 부족해.
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