DETERMINATION OF WATER QUALITY STATUS BASED ON HEAVY METAL CONTENTS IN THE RAINY AND DRY SEASON USING THE STORET INDEX IN PASURUAN SEA WATERS , EAST JAVA
Background : The Pasuruan Sea is a strategic waterway in East Java which is precisely located in the Madura Strait area. Pasuruan is also one of the highest shellfish and fish producing areas, namely at Lekok Beach, which is generally in line wih the flow of the Rejoso River and several other tributaries.
Previously, this area was an area for industrial and agricultural activities so it was considered to have the potential to result in a build up of river waste which would ultimately pollute thesea. In fact, research results show that the concentration level inLekok Waters exceeds the safe threshold of 0,44 mg1 so that maine biodata from these waters, such as shellfish meat, is said to be unsafe for consumption. So the level of pollution caused by heavy metals needs to beconsidered for water restoration. Objective : of this research is to determine the level of water quality based on calculating the heavy metal content in the rainy season and dry season. Regarding the method that was decided to carry out this research, it was to use a direct survey method of Pasuruan Sea Waters with two different seasons, namely the rainy season and the dry season. Then samples were taken using purposive sampling at three locations in the Marine Waters of Kraton, Lekok and Nguling Districts using trevally (Selaroides leptolepis) as the organism identified as heavy metals. The test method is to preserve fish kidney samples in a cool box containing ice tubes. Then water samples are taken from each body of water to be tested into 600 ml plastic bottles which are then put into a cool box as well. Next, analysis of the heavy metals Pb Hg and CD was carried out in the laboratory on the kidney samples of trevally fish and water samples from each marine location tested.
