Preliminary study of lead and mercury concentrations in seven commercial seafood at Lombok Island, Indonesia

Fish and other marine biota such as shrimp and shellfish are important foods besides agricultural products coming from the mainland. Lombok Island - West Nusa Tenggara has large and diverse fishery resources. In addition, Lombok has mineral resources, an example of these being the gold that is mined both traditionally and using modern technology. These mining activities can impact not only the surrounding environment, but also far away coastal areas due to river run off. This study aims to examine the heavy metal contamination level in seven consumed biotas at Lombok Island. Sampling was conducted at the Fish Auction Market (Tempat Pelelangan Ikan - TPI) Tanjung Luar from 25 to 30 September 2015. Samples were identified before measurement and weighting. Sample analysis for lead (Pb) and mercury (Hg) concentrations use APHA method, 2012, 4500-N-C and APHA, 2012, 4500-P-E respectively. The results show that lead (Pb) content was detected in Anadara sp. and pearl lobster ranging from 0 to 2.25 mg/kg, with an average of 0.4 mg/kg. The content of lead in Anadara sp. and pearl lobster is beyond the safe level for consumption according to SNI 7387:2009 (Indonesia Reference Threshold). Mercury is detected in three biotas: Anadara sp., Mugil sp. and crab with a range of 0.002-0.06 mg/kg and can be categorized at safe levels to be consumed