Which unit is used to measure the concentration of contaminants in soil and sediment?
Show answer & explanation
Correct answer: D
Explanation
The correct answer is option 4 i.e. PPM.
The concentration of contaminants in soil and sediment is typically measured in milligrams per kilogram (mg/kg) or parts per million (ppm). These units indicate the mass of a contaminant per unit mass of soil or sediment. For example, 1 mg/kg means 1 milligram of a contaminant is present in 1 kilogram of soil. In some cases, micrograms per kilogram (µg/kg) or parts per billion (ppb) are used for very low concentrations. These units are crucial for environmental assessments and ensuring compliance with safety standards.