info:oai:myais.fsktm.um.edu.my:1081info:ofi/fmt:xml:xsd:journalarticleNorela Sulaiman Maimon Abdullah Mohd. Rozali Othman 1102006Malaysian Journal of Analytical SciencesKepekatan Plumbum, Kadmium, Nitrat dan Ammonium di Udara109-114