Sains Malaysiana 30: 167-176 (2001)                                                                           Sains Hayat/

        Life Sciences

Pengambilan Logam-Iogam Berat Terpilih

dalam Tanah oleh Sayur-sayuran

(Uptake of Selected Heavy Metals from Soil by Vegetables)

Khairiah Jusoh, Salmijah Surif

Program Sains Sekitaran

Pusat Pengajian Sains Sekitaran dan Sumber Alam

Fakulti Sains dan Teknologi

Universiti Kebangsaan Malaysia

43600 UKM Bangi, Selangor D.E. Malaysia

Aminah Ahmad & Benjamin Akmal

Program Sains Makanan dan Pemakanan

Pusat Pengajian Sains Kimia dan Teknologi Makanan

Fakulti Sains dan Teknologi

Universiti Kebangsaan Malaysia

43600 UKM Bangi, Selangor D.E. Malaysia

ABSTRAK

Penentuan kandungan logam berat dalam tanah dan sayuran telah dijalankan di kawasan Bangi, Gombak dan Sepang. Logam berat yang dikaji termasuklah Pb, Cd, Zn dan Cu. Sampel tanah diekstrak dengan menggunakan kaedah pengekstrakan penjujukan merangkumi pengekstraksian logam-logam berat dalam pecahan lukar ganti ion dan mudah luluhlarut, pecahan penurunan asid, pecahan oksidasi organik dan pecahan rintang. Penghadaman basah telah digunakan untuk menghadam sampel sayur. Hasil analisis menunjukkan purata kepekatan logam-logam Pb, Cd, Cu dan Zn paling tinggi dalam pecahan rintang iaitu masing-masing 55.88 mg/kg dari Gombak, 4.20 mg/kg dari Bangi, 14.64 mg/kg dari Sepang dan 71.50 mg/kg dari Gombak. Aras kepekatan Pb, Cd, Zn dan Cu dalam sayuran kajian masih berada di bawah had yang dibenarkan oleh Akta Makanan (1983) dan Peraturan Makanan (1985) Malaysia iaitu masing-masing 2.00 mg/kg, 1.00 mg/kg, 30.00 mg/kg dan 40.00 mg/kg.

ABSTRACT

Heavy metals content in the soil and vegetables samples obtained from Bangi, Gombak and Sepang were studied. Heavy metals studied include Pb, Cd, Zn and Cu. Soil samples were extracted by sequential extraction method, which extracted heavy metals from easily leachable fraction, acid reducible fraction, organic oxidation fraction and resistant fraction. Wet digestion method was used for extraction of heavy metals in vegetables. The result of the study showed that high concentration of Pb, Cd, and Zn were found in the resistant fraction which were 55.88 mg/kg from Gombak, 4.20 mg/kg from Bangi, 14.64 mg/kg from Sepang and 71.50 mg/kg from Gombak respectively. The concentration of Pb, Cd, Zn and Cu in vegetables were below the maximum levels permitted by the Malaysian Food Act (1983) and Food Regulation (1985) with values of 2.00 mg/kg, 1.00 mg/kg, 30.00 mg/kg and 40.00 mg/kg respectively. 

RUJUKAN/REFERENCES

Akta Makanan. 1983, dan Peraturan Makanan. 1985. Warta Kerajaan Malaysia 29.

Annika, E.E. & Morrison, G.M. 1992. Fractionation and toxicity of metals in sewage sludge. Environmental Technology 13: 751-759.

Badri, A.M. 1984. A study of comparative behaviour of selected heavy metals in polluted and unpolluted estuarine and coastal sediments. Ph.D Thesis. University of Lancaster, UK.

Balch, G.E. & Jones, R. 1992. Zinc in plants, sediment, snow and ice around a galvanised transmission tower in a Beaver Pond. Water, Air and Soil Pollution. 59: 145-152.

Biro Penyelidikan dan Rundingan UKM. 1991. Environmental Impact Assessment for Kajang Industrial Estate Selangor Darul Ehsan. Universiti Kebangsaan Malaysia, Bangi, Selangor D.E.

Bosque, M.A., Schuhmacher, M., Domingo, J.L. & Llobet, J.M. 1990. Concentration of lead and cadmium in edible vegetables from Tarragona Province, Spain. Science. Environmental 95: 61-67.

Davies, B.E. 1992. Inter-relationship between soil properties and the uptake of cadmium, copper. Lead and zinc from contaminated soils by raddish (Raphanus sativus L.). Water, Air and Soil Pollut. 63: 331-342.

Domergue, F.L. & Vedy, J.E. 1992. Mobility of heavy metals in soil profiles. International Environmental Chemistry 46: 13-23.

Forstner, U. 1988. Analysis and prognosis of metal mobility in soils and wastes. Dlm. Wolf, K., van den. Brink, W.1. dan Colon. F.1. (pnyt). Contaminated soil 188: 1-10. Netherland: Kluwer Academic Publishers.

Goyer, R.A. 1988. Lead. In Handbook on Toxicity of Inorganic Compounds. Seiler, H.G. & Siegel, A (pnyt.). New York: Marcel Dekker.

JAS. 1996. Laporan Kualiti Alam Sekeliling. Kementerian Sains, Teknologi dan Alam Sekitar.

Khairiah Jusoh, 1988. Kajian pencemaran logam-logam berat di dalam sistem sungai dengan rujukan khas kepada kawasan perbandaran Kuala Lumpur. S.Sn. Universiti Kebangsaan Malaysia.

Mortvedt, J.J. 1987. Cadmium level in soils and plants from long-term soil fertility experiments in the United States of America. Journal of Environmental Quality 16: 424-427.

Otte. M.L., Bestebroer, S.J., Van Der Linden, J.M., Rozema, J. & Broekmen, R.A. 1991. A survey in zinc, copper and cadmium concentrations in salt marsh plants along the Dutch Coast. Environmental Pollution 72: 175-189.

Sahu, S. & Banerjee, O.K. 1990. Complexation properties of typical soil and peat humic acids with copper (II) and cadmium (II). International Journal Environmental Analytical Chemistry 42: 35-44

Shahunthala, D. 1986. Heavy metal level in some Malaysian shellfish. Bulletin Perikanan 44.

Shamshudin Jusop. 1990. Sifat dalam pengurusan tanah di Malaysia. Kuala Lumpur: Dewan Bahasa dan Pustaka.

Tan, W.H. & Khoo, S.H. 1981. The utilization of ex-mining land in Peninsular Malaysia. Malaysian Geographers 3: 36-46.