Table of Contents: 1  INTRODUCTION, DEFINITION & VALUE OF RESEARCH. 2  SCIENTIFIC METHOD OF RESEARCH & ITS SPECIAL FEATURES. 3  CLASSIFICATION OF RESEARCH:Goals of Exploratory Research. 4  THEORY AND RESEARCH:Concepts, Propositions, Role of Theory. 5  CONCEPTS:Concepts are an Abstraction of Reality, Sources of Concepts.
Lead poisoning is a serious and sometimes fatal condition. It occurs when lead builds up in the body. Lead is a highly toxic metal and a very strong poison. It is found in lead-based paints, including paint on the walls of old houses and toys.
Lead (Pb) is a heavy metal that occurs in low levels in all soils. Natural concentrations of lead in. most soils range from 10 to 30 parts per million (ppm). (Lead concentration is commonly expressed. on a mass basis: a level of 1 part per million [ppm] corresponds to 1 milligram [mg] of lead in.