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Calcium is a metal whose presence can be used as an indicator of ocean acidification. Acidification of sea water occurs due to the effects of global warming. The form of Ca in calcium carbonate can be leached under acidic conditions. The assessment of Ca is very important to control of coral bleaching. This research used the BCR microwave method to investigate the residence of Ca bound to each fraction. The results showed the residence of 73 percen in fraction 1 and 22 percen in fraction 4 from total of Ca in sludge sediment. The highest level of Ca (64350.27 mg / kg) in the fraction 1 was compared with those in fraction 2, 3, and 4 indicating the easily mobilized of bleaching Ca in seawater and then deposited in sludge sediment.