section I. Geology, hydrology, and hydrogeology of arsenic -- section II. Ecological effects : arsenic in soils, plants and food chain cycle -- section III. Arsenic in marine and terrestrial ecosystems -- section IV. Health effects on humans, epidemiology, biomarkers and risk assessments -- section V. Toxicological effects : animal models -- section VI. Assessment and remediation of arsenic contaminated groundwater and land environments, policy and protection -- section VII. Analytical methods for arsenic -- section S1. Special topic 1: Arsenic in Latin America : a forgotten continent -- section S2. Special topic 2: The geochemistry and microbiology of arsenic and humic substances in aquifers of the Blackfoot Disease area, southwestern Taiwan -- section S3. Special topic 3: Arsenic in rice : advances and challenges to minimizing hazard.