| dc.description.abstract | Telah dilakukan penelitian tentang validasi metode destruksi basah tertutup (hotplate dan microwave) dan penentuan kadar logam timbal dalam kondisioner secara spektrometri serapan atom (SSA). Langkah-langkah penelitian: 1) validasi metode destruksi (hotplate dan microwave) menggunakan standar Pb(NO3)2. Validasi metode destruksi berdasarkan empat parameter uji yaitu linearitas, presisi, akurasi, LOD/LOQ; 2) uji statistik menggunakan spss serta t-test pada validasi metode destruksi; 3) destruksi sampel kondisioner menggunakan metode destruksi tervalidasi; 4) penentuan kadar logam timbal dalam kondisioner dengan SSA. Hasil menunjukkan bahwa dari kurva kalibrasi didapatkan hasil linearitas logam Pb sebesar 0,9984. Validasi metode destruksi hotplate memiliki nilai %RSD 1,70% sedangkan microwave memiliki nilai %RSD 4,21% sehingga kedua metode tersebut memiliki presisi yang baik karena nilai %RSD < 10,19, nilai recovery pada hotplate 93,31% dan microwave 91,43% sehingga kedua metode tersebut memiliki akurasi yang baik karena memenuhi syarat %recovery yaitu 70-115%. Nilai LOD diperoleh sebesar 1,056 ppm dan nilai LOQ diperoleh sebesar 3,520 ppm. Berdasarkan uji t-test, diperoleh metode destruksi basah tertutup terbaik yaitu motode destruksi hotplate. Kadar rata-rata timbal yang diperoleh dari sampel A sebesar 3,104 mg/L. Hasil tersebut menunjukkan sampel A masih memenuhi syarat standar batas kadar logam timbal pada kosmetik yaitu < 20 ppm.
A research of the validation of closed wet destruction methods (hotplate and microwave) and determination of lead metal content in a conditioner by atomic absorption spectrometry (AAS) has been done. Stages of this research were: 1) validation of destruction methods (hotplate and microwave) using Pb(NO3)2 standard. Validation of destruction method based on four test parameters including linearity, precision, accuracy, and LOD/LOQ; 2) statistical test using spss and t-test on validation of destruction method; 3) destruction of sample conditioner using validated destruction method; 4) determination of lead metal content in conditioner with AAS. The results showed that from calibration curve, the linearity of lead metal was 0.9984. The hotplate method validation had a value of RSD 1.70% while the microwave method has a value of RSD 4,21% so both methods had good precision because a value of RSD < 10.19%, value recovery on hotplate was 93.31% and microwave was 91.43% so both methods have good accuracy because it met the percentage of recovery requirement that was 70-115%. LOD value obtained was 1.056 ppm and LOQ value obtained was 3.520 ppm. Based on the t-test, the optimal closed wet destruction method was the hotplate destruction method. The average of lead content obtained from sample A was 3.104 mg/L. The results showed that sample A still met the standard limit of lead metal content in cosmetic that was < 20 ppm. | en_US |
