Abstract
The coastal waters of Wonorejo is part of the East Coast Surabaya which receive the brunt of watersheds (DAS) from other rivers. The main source of heavy metal wastes in the River on the downstream Wonorejo pass several industries suspected of disposing of hazardous waste. One of the main heavy metal which is a toxic element and effect on aquatic ecological systems are cadmium (Cd).Mud crab is one potential biota found in the mangrove area of Wonorejo River Surabaya can accumulate heavy metals. This research was carried out in April 2018 with sampling at three stations with time each week for three times.Analysis of heavy metals cadmium (Cd) in mud crabs ( Scylla sp.), water and sediments carried out in the laboratory of nutrition of the Faculty of public health University Airlangga. Research method using observation which is channeled in the waters and farmed in Wonorejo Surabaya. Mud crab meat samples, water and sediments tested using Atomic Absoption Spectrophotometry (AAS). The results of the test concentration of heavy metals cadmium (Cd) in mud crab meat on the river Wonorejo i.e. 0.032 mg.kg -1 where the value of these levels are still below the threshold of quality raw heavy metal Cd on crustaceans i.e. 1 mg.kg-1 (SNI 7387:2009). The Cd content in water of Wonorejo river in between 0.014-0.02 ppm and on sediments between 0.234-0.416 mg/kg. Correlation of cadmium content in water with crab meat in the correlation coefficient shows of Wonorejo -0.22 (a weak correlation, a negative direction). Then, the correlation of the content of cadmium in sediments with crab meat in the correlation coefficient shows of Wonorejo 0.285 (of correlation is weak, the positive direction).
Highlights
The coast of Wonorejo is part of eastern coastline in Surabaya that directly receives load of river current area (DAS) from another river
The data od this study is displayed as cadmium (Cd) heavy metal concentration which is extracted from mud crab flesh, the water, and the sediment, it is processed by correlation test through Statistical Product And Service Solution program (SPSS) 22 Version
The cadmium heavy metal concentration found in three stations of Wonorejo river shows the number between 0,014 – 0,02 ppm that already exceed maximum threshold policy which is stated in The Ministry of Environment Decision number 51 of 2004 about the basic quality of marine life which is 0,001 ppm
Summary
The coast of Wonorejo is part of eastern coastline in Surabaya that directly receives load of river current area (DAS) from another river. One of main heavy metal which is a toxic element and potentially damage marine ecology system is cadmium (Cd). The latest result of cadmium concentration test in Wonorejo river was conducted by environment council of Surabaya in 2008-2009, the concentration was 0,05 mg/L which already exceed basic quality heavy metal waste concentration. Mud crab is one of marine potential resource that could be fund among mangrove forest of Wonorejo river Surabaya. The annual statistic report of fishery production of mud commodity in east java province, especially in Surabaya, reaches about 210 tons (fishery and marine office, 2014). 2019, Analysis of Heavy Metal Cadmium (Cd) on Mud Crab security and agricultural office of Surabaya, 2017).
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