Assessment of Lead and Cadmium Concentrations in Rice and Pulses and Implications for Human Health Risk

Area of Science:

• Environmental Science
• Food Safety
• Toxicology

Background:

• Widely consumed cereals and pulses are potential sources of heavy metal contamination.
• Lead (Pb) and cadmium (Cd) are carcinogenic heavy metals with known health implications.

Purpose of the Study:

• To quantify lead and cadmium levels in rice, black gram, and lentils from Dhaka markets.
• To assess human health risks associated with the consumption of these contaminated food items.

Main Methods:

• Random sampling of cereals and pulses from local markets in Dhaka, Bangladesh.
• Quantification of lead (Pb) and cadmium (Cd) using appropriate analytical techniques.
• Health risk assessment using Estimated Daily Intake (EDI), Incremental Lifetime Cancer Risk (ILCR), Target Hazard Quotient (THQ), and Hazard Index (HI).

Main Results:

• Lead and cadmium were detected in most samples, with 20-80% exceeding regulatory maximum limits.
• Estimated Daily Intake (EDI) for cadmium in rice and black gram exceeded Provisional Tolerable Daily Intake (PTDI) limits.
• Incremental Lifetime Cancer Risk (ILCR) exceeded the safety threshold (10^-4) for most samples, indicating potential carcinogenic risk.
• Target Hazard Quotient (THQ) for cadmium in rice surpassed 1.0 for children, and Hazard Index (HI) exceeded 1.0 for both adults and children, indicating non-carcinogenic risks.

Conclusions:

• Consumption of rice, black gram, and lentils in Dhaka poses significant health risks due to lead and cadmium contamination.
• Findings highlight the urgent need for improved food safety measures, regulatory enforcement, and consumer protection in Bangladesh.
• The study provides crucial data for policymakers to address heavy metal contamination in staple foods.