수질오염개론수질환경기사 · 2020년06월06일 · 9/100
9.수질분석결과 Na+=10mg/L, Ca+2=20mg/L, Mg+2=24mg/L, Sr+2=2.2mg/L일 때 총경도(mg/L as CaCO3)는? (단, 원자량 : Na=23, Ca=40, Mg=24, Sr=87.6)
1
112.5
2
132.5
3
152.5정답
4
172.5
해설
20×(50/20)+24×(50/12)+2.2×(100/87.6/2) =152.51mg/L as CaCO3