| dc.description.abstract | Have been done by quantitative analysis of calcium (Ca) and magnesium (Mg) at the deep well, feed water and water boiler which applied as steam injection from PT. COCA - COLA BOTTLING INDONESIA. Sample was obtained in purposif and without care the season of sampling time that done on first, second and third sunday. Calsium (Ca) and magnesium (Mg) content was analysed using complexometry titration method. The research result has been obtained calcium content on first, second, third sunday in water source that used is deep well 0.0127 ± 0.0004 mg/L; 0.0130 ± 0.0004 mg/L; 0.0131 ± 0.0009 mg/L and magnesium about 0.0072 ± 0.0002 mg/L; 0.0070 ± 0.0004 mg/L; 0.0072 ± 0.0007 mg/L. It can cause crust at boiler, so that very needed water treatment process before used as steam injection. For feed water was low content and it if didn’t cause crust at boiler because, before treatment process water. Calcium content on first, second, third about 0.0009 ± 0.0004 mg/L; 0.0010 ± 0.0004 mg/L; 0.0010 ± 0.0004 mg/L and magnesium about 0.0020 ± 0.0007 mg/L; 0.0021 ± 0.0004 mg/L; 0.0022 ± 0.0002 mg/L. Where as calcium content and magnesium at boiler water as receiver system from feed water, every week happen increase. Calcium content on first, second and third Sunday at boiler water about 0.0064 ± 0.0009 mg/L; 0.0089 ± 0.0009 mg/L; 0.0133 ± 0.0009 mg/L and magnesium about 0.0040 ± 0.0002 mg/L; 0.0050 ± 0.0002 mg/L; 0.0062 ± 0.0002 mg/L. | en_US |
