EFFECT OF CHROMIUM (Cr) AND UREA ON ACCUMULATION OF LEAD IN WATER SPINACH (Ipomoea reptans Poir)

• Main Author: Rohaningsih, Denalis
• Format: Theses
• Language: Indonesia
• Subjects: Teknik saniter dan perkotaan; teknik perlindungan lingkungan
• Online Access: https://digilib.itb.ac.id/gdl/view/32067
• Institution: Institut Teknologi Bandung

Lead, a heavy metal that harms different organisms, has been found in the waste of the garment industry in industrial area of Leuwigajah, Cimahi. As lead accumulated easily in water and soil via waste being discharged into the environment, plants in the contaminated area can absorb this hazardous substance. This situation calls into an assessment of “to which extent the toxicity of lead can impact the growth of plants”. Within the research scope, only water spinach (Ipomoea reptans Poir) will be studied. Beside the dose of lead, the study also takes the presence of chromium into consideration. The sequences of research include: (1) An initial measurement of soil from sampling site, (2) planting design, (3) plantation of water spinach, (4) havest/sampling, and (5) analysis of metal. Lead concentration analysis begin with one-week-old water spinach. Analysis of lead performed by atomic absorption spectrophotometry method. Four variations of planting medium has been made. The result showed that lead mostly accumulated in leaves except variant A which accumulate more lead in root. Until day 20th, lead concentration in water spinach plant tissues not yet exceed the regulation for maximum lead in vegetables (0.5 ppm). On day 25th, water spinach variant A has the highest lead accumulation in its plant tissues amount 125.25 mg/kg vegetable. The presence of chromium in plant medium variant C proven influenced water spinach plant tissues with significant level 0.037. Chromium also proven decreased the accumulation of lead in root and leaves of water spinach with significant level each 0.037 and 0.024. Addition of urea into lead polluted soil decreases the accumulation of lead in root of water spinach. However, it has no influence on lead distribution to leaves part. On day 35th, water spinach variant D has the lowest value of lead translocation factor, 0. 40. Thus, 35 days is the safe periode to harvest water spinach. Based on comparison of the value of bioconcentration factor and translocation factor, water spinach planted at study area is safe to be consumed by people.