CD Skripsi
Fotodegradasi Bahan Aktif Klorpirifos Pada Medium Gambut Yang Diberi Biochar Cangkang Kelapa Sawit
ABSTRACT
This study aimed to evaluate the degradation rate of chlorpyrifos due to sunlight exposure and exposure duration in peat soil. The research was conducted experimentally using a factorial Completely Randomized Design (CRD) with two treatment factors. The first factor was sunlight exposure (direct and indirect), and the second was the duration of exposure (0, 7, 14, 21, and 29 days). Each treatment combination was replicated three times, resulting in a total of 30 experimental units. The results showed that both sunlight exposure and duration had a significant effect on the reduction of chlorpyrifos concentration in peat soil. Direct sunlight exposure was more effective than indirect exposure, with a maximum reduction of 13.08% after 29 days. This indicates that chlorpyrifos degradation occurred gradually and was enhanced by increased light intensity and exposure duration. After 29 days, direct exposure reduced the half-life of chlorpyrifos to 52.5 days, compared to 57.75 days under indirect exposure. These findings demonstrate that direct sunlight and longer exposure durations accelerate the degradation process of chlorpyrifos. Chlorpyrifos in peat soil is classified as moderately degradable, meaning it is neither rapidly degraded nor highly persistent. The addition of palm shell biochar also played a role in increasing bacterial activity in the soil, with bacterial populations rising from 3×10⁵ CFU/g at the beginning to 2×10⁶ CFU/g at the end of the experiment. This increase reflects enhanced microbial activity in the soil, indicating that biochar serves as an effective ameliorant in promoting soil microbial populations.
Keywords: sunlight exposure, degradation rate, half-life, persistence
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