No abstract

Cosmetics are materials or preparations intended for use on the outside of the human body, one of which is facial whitening cream. Face whitening cream is part of cosmetics that contains a mixture of chemicals that are efficacious to reduce skin hyperpigmentation so that the skin looks brighter. One of the ingredients that should not be used in facial whitening creams is mercury. The addition of mercury in facial whitening creams has been prohibited if it exceeds 1mg/kg because it is very dangerous. Mercury content in facial whitening cream can be analyzed using Atomic Absorption Spectrophotometry (AAS). The purpose of the study was to determine the mercury (Hg) and mercury (Hg) levels in facial whitening creams circulating in the Pasar Andir area of ​​Bandung. Research Methods: This study used a descriptive method. knowing the description of mercury (Hg) levels in whitening cream circulating in the Andir Bandung market area using the Atomic Absorption Spectrophotometer (AAS) method. Based on the research results from eleven samples of whitening cream, 5 samples of whitening cream were positive for mercury and 6 samples were negative for mercury. In sample 001 obtained mercury levels of (0.05 mg/Kg), sample 005 (1361.50 mg/Kg), sample 006 (0.43 mg/Kg), sample 007 (0.02 mg/Kg), sample 010 (0.12 mg/Kg), and samples that did not contain mercury were found in samples 002, 003, 004, 008, 009 and 011, namely 1mg/Kg, namely (< 0.005 mg/Kg). Sample 005 contained 1361.50 mg/Kg of Mercury, so the cream sample did not meet the requirements for distribution according to the provisions of the Head of the BPOM.

Development in agricultural field can not be separated from pesticides, used to eradicate pests. Continuely use by farmer caused poisoning, that can be measured by cholinesterase levels in blood. This research tried to identify correlation between work period and cholinesterase level in farmer’s blood. Research was carried using cross sectional method with 43 farmers from Desa Pasirhalang Kecamatan Cisarua, Kabupaten Bandung Barat. Farmer’s work periods were 51,2% that have work more than 15 years and 48,8% that have work less then 15 years. Poisoning levels were 14% severe poisoning (50 – <75% cholinesterase level) and 86% normal (75 - 100% cholinesterase levels). Correlational statistic using Spearman test showed that there was no significant correlation between work period and cholinesterase levels in farmer’s blood.

Rhodamine B is a synthetic dye that is often misused as a food coloring in crackers. Rhodamine B consumption through food can irritate the digestive tract, impair liver function, and cancer. The purpose of the study was to determine the content of rhodamine B in crackers. This study used a quantitative method, and purposive sampling was employed as a sampling technique. Method validation was carried out against a UV-Visible spectrophotometer in testing Rhodamine B in crackers. Validation of the method produces a linear regression equation of y = 0.2901x + 0.0082, with a correlation coefficient value (r2) = 0.9985, and a Vxo value of 2.65%. The instrument validation shows a Limit of Detection (LOD) of 0.1582 ppm and a Limit of Quantification (LOQ) of 0.5274 ppm. The results from the accuracy-test showed an average %diff of 0.88%; 3.79%, and -6.88%, while the average percentages of recovery were 101%, 104, and 93% respectively. Precision testing results showed that the value of % RSD 2/3 CV Horwitz. Qualitative measurements showed that all samples tested for Rhodamine B in this study showed negative results. This study suggested that UV-Visible spectrophotometry is a valid method that can be used to measure levels of Rhodamine B in food.

Limbah Cr(VI) dapat mengganggu kesehatan karena bersifat toksik, maka perlu dilakukan pengolahan air sungai terlebih dahulu. Salah satu Teknik pengolahan alternatif yaitu menggunakan metode biosorpsi dengan biosorben ampas daun teh. Namun hasil penyerapan itu tergantung oleh beberapa faktor salah satunya yaitu waktu kontak. Tujuan penelitian ini untuk mengetahui waktu kontak optimum terhadap proses biosorpsi Cr(VI) dengan menggunakan biosorben ampas daun teh. Penelitian ini menggunakan metode deskriptif kuantitatif. Sampel yang digunakan air Sungai Citarum yang diambil dari empat titik yaitu di Desa Pangauban, Desa Cilampeni, Desa Nanjung dan Desa Lagadar. Pengukuran kadar dilakukan menggunakan Spektrofotometer UV-Vis pada panjang gelombang 540 nm. Berdasarkan penelitian ini diperoleh waktu kontak optimum yaitu 45 menit dengan presentase penurunan kadar dari masing-masing sampel yaitu 73,25% (Desa Pangauban), 75,94% (Desa Cilampeni), 71,88%, (Desa Nanjung) dan 74,31% (Desa Lagadar). Oleh karena itu, waktu kontak merupakan faktor yang perlu diperhatikan dalam proses biosorpsi untuk pengolahan limbah logam berat Cr(VI).