Electronic Theses and Dissertation

Logam timbal (Pb) dan Kadmium (Cd) merupakan logam berat yang sangat beracun jika terakumulasi di dalam tubuh dapat menyebabkan penyakit yang sangat serius bahkan kematian. Penelitian ini bertujuan untuk mengetahui kandungan ion logam Pb dan Cd pada spesies tiram Crassostrea gigas dan Saccostrea cucullate di daerah Lampulo dan Krueng Cut pada masing-masing tiga titik yang berbeda. Analisis kandungan logam Pb dan Cd dilakukan menggunakan spektrofotometer serapan atom (SSA) dan Ultraviolet-visibel (UV-Vis). Sampel dipreparasi menggunakan destruksi basah HNO3 pekat dan penambahan senyawa kompleks dithizon. Hasil penelitian menunjukkan bahwa kadar Pb dan Cd menggunakan SSA dan UV-Vis logam Pb (SSA) pada spesies Saccostrea cucullata 2,33-8,00 ppb Pb (UV-Vis) 2,77-8,66 ppb, Pb (SSA) pada spesies Crassostrea gigas 1,77-10,30 ppb dan Pb (UV-Vis) 2,11-10,66 ppb, dan pada logam Cd (SSA) pada spesies Saccostrea cucullata 3,80-10,50 ppb , Cd (UV-Vis) 4,29-10,77 ppb, dan pada spesies Crassostrea gigas (SSA) 12,11-13,22 ppb (UV-Vis) 12,77-13,66 ppb. Linearitas pengukuran Pb dengan SSA dan UV-Vis diperoleh masing-masing nilai koefisien determinasi R2 =0,9979; R2 =0,9938 serta logam Cd R2 =0,9986; R2 =0,9810. Akurasi (%recorvery) pengukuran logam Pb pada metode SSA dan UV-Vis masing-masing sebesar 80-110% ; 98-110% serta logam Cd 100-106% ; 91-107%. Nilai relatif standar deviasi (% RSD ± SD) adalah 0,001 menunjukkan hasil pengukuran yang sangat baik. Berdasarkan perhitungan uji-t, pengukuran kadar logam Pb dan Cd menunjukkan tidak ada perbedaan antara metode SSA dan metode UV-Vis.

Lead (Pb) and Cadmium (Cd) metals are heavy metals that are very toxic if accumulated in the body and can cause very serious diseases and even death. This study aimed to determine the metal content of Pb and Cd in the oyster species Crassostrea gigas and Saccostrea cucullate in the Lampulo and Krueng Cut areas at three different points each. Analysis of the metal content of Pb and Cd was carried out using atomic absobtion (AAS) and Ultraviolet-visible (UV-Vis) spectrophotometers. Samples were prepared using concentrated HNO3 wet destruction and the addition of dithizone complex compounds. The results showed that Pb and Cd levels using AAS and UV-Vis metal Pb (AAS) in Saccostrea cucullata species 2.33-8.00 ppb, Pb (UV-Vis) 2.77-8.66 ppb, Pb (AAS) in Crassostrea gigas species 1.77-10.30 ppb, and Pb (UV-Vis) 2.11-10.66 ppb, and in metal Cd (AAS) in Saccostrea cucullate species 3.80-10.50 ppb, Cd (UV-Vis) 4.29-10.77 ppb, and in Crassostrea gigas (AAS) 12.11-13.22 ppb (UV-Vis) 12.77-13.66 ppb species. Linearity of Pb measurements with SSA and UV-Vis obtained the value of the coefficient determination R2 =0.9979 each; R2 =0.9938 and metal Cd R2 =0.9986 ; R2 =0.9810. Accuracy (%recorvery) of Pb metal measurements with AAS and UV-Vis of 80-110% each; 98-113% as well as metal Cd 100-106%; 91-107%. The relative value of the standard deviation (%RSD ± SD) is 0.001 indicating excellent measurement results. Based on t-test calculations, measurements of Pb and Cd levels showed no difference between the AAS method and the UV-Vis method