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Heavy metal pollution is one of the most serious environmental issues globally. To evaluate the metal pollution in the Red Sea coast of Hodeida, Yemen Republic, the concentrations of Fe, Cu, Ni, Pb, and Cd in water, sediment, and some vital organs of sea catfish, Arius thalassinus collected from polluted and unpolluted sites, were determined. The risk of these metals to humans through fish consumption was then assessed. The results showed that the concentration order of metals in water, sediment, and fish tissues were Fe > Cu > Ni > Pb > Cd. The levels of studied metals in water, sediment, and fish tissues were significantly higher in the polluted site than those of the unpolluted site, with few exceptions. Linear correlation incorporating paired variables (water-sediment, water-fish, and fish-fish) exhibited several significant correlations indicating a common metal pollution. The risk assessment performed revealed that fish consumption was safe for consumers. This field investigation provides a baseline data on metal pollution in this region.

Penelitian ini bertujuan untuk menganalisis besarnya pendapatan pengrajin gula aren di Desa Tulo’a dan untuk menganalisis besarnya keuntungan pengrajin gula aren  di Desa Tulo’a. Penelitian ini dilaksanakan pada bulan mei sampai bulan juli 2013. Metode yang digunakan dalam penelitian ini adalah metode survey yang terdiri dari data primer yang diperoleh melalui wawancara dengan pengrajin gula aren dengan menggunakan kuisioner/daftar pertanyaan dan data sekunder diperoleh dari Kantor Desa Tulo’a serta Dinas Perindustrian dan Perdagangan Kabupaten Bone Bolango. Teknik pengambilan sampel dilakukan dengan menggunakan metode sampling jenuh atau sensus dimana semua anggota populasi responden dijadikan sampel. Analisis data yang digunakan yaitu biaya tetap, biaya variabel, total biaya, penerimaan, pendapatan, dan analisis R/C Ratio. Hasil penelitian menunjukkan bahwa rata-rata pendapatan bersih/keuntungan yang diperoleh pengrajin gula aren di Desa Tulo’a yaitu sebesar Rp. 1.395.684/bulan atau Rp. 16.748.208/tahun. Dengan nilai R/C Ratio sebesar 2,12. Berdasarkan kriteria nilai R/C Ratio lebih dari satu berarti dapat dikatakan usaha pengrajin gula aren di Desa Tulo’a menguntungkan dan layak untuk diusahakan. Keywords: Pengrajin, Gula Aren, Pendapatan, Keuntungan

The objective of the study was to examine the levels of mercury concentrations in plants due to the traditional gold mining of Buladu, Sumalata District, Gorontalo Regency. Buladu gold mining was located in Sumalata District, North Gorontalo Regency, Gorontalo Province. Plant samples were taken in 3 locations, namely plants living along the Hulawa River, living near to the tailings and those in residential areas. The number of plants that became the samples along the Hulawa River were 13 samples, 5 samples in the tailings, and 16 samples in residential areas. The total number of plants were as many as 34 samples. The samplings were taken from the roots and leaves so that there were a total of 68 samples. Plant analysis was carried out using mercury analyzer at UGM Integrated Research and Testing Laboratory. The quality standard used as a reference for plants employed the Decree of the Director General of National Agency of Drug and Food Control No: 03725 / B / SK / VII / 89, where mercury levels could not exceed 0.5 mg / kg. Data analysis used tables and graphs and was subsequently interpreted. The results showed that the concentration of mercury in the leaves of plants living along the Hulawa River ranged from 0.00142 mg / kg to 0.41617 mg / l and that in the root ranged from <0.00014 - 14.890 mg / kg. Mercury concentrations in plants living around the tailings in leaves ranged between <0.00014 - 1.30822 and at roots ranging from 0.01058 - 12.59366. In residential areas, the concentration of mercury in leaves ranged from <0.00014-1.44368 mg / kg and in the root ranged from <0.00014-1.94505. Based on these results, the concentration of mercury in plants along the river, around the tailings and in the people’s resident area tended to be above the quality standards set by the Decree of the Director General of National Agency of Drug and Food Control No: 03725 / B / SK / VII / 89.