o Arsenic(As)-production and use 8% 22% 70% O Timber treatment (CCA-copper chrome arsenate O Agricultural chemical (pestcide/herbacides, animal feed) D Others(pharmaceutical, glass, non-ferrous alloys) Assoc Prof. TorOve Leiknes
Assoc.Prof. TorOve Leiknes 6 Arsenic (As) – production and use 70 % 22 % 8 % Timber treatment (CCA - copper chrome arsenate) Agricultural chemical (pestacide/herbacides, animal feed) Others (pharmaceutical, glass, non-ferrous alloys)
o Arsenic(As)-Environmental levels Air rural areas.02-4 ng/m3 urban areas-3-200 ng/m industrial areas >1000 ng/m3 Open sea water average concentration -1-2 ug/liter Assoc Prof. TorOve Leiknes
Assoc.Prof. TorOve Leiknes 7 Arsenic (As) – Environmental levels: Air: • rural areas – 0.02 – 4 ng/m3 • urban areas – 3 – 200 ng/m3 • industrial areas > 1000 ng/m3 Open sea water: • average concentration – 1 – 2 µg/liter
o Arsenic(As)-Environmental levels Fresh water generally below 10 ug/liter near anthropogenic sources-5 mg/liter ground water average -1-2 ug/liter geology dependent-up to 3 mg/liter 8 Assoc Prof. TorOve Leiknes
Assoc.Prof. TorOve Leiknes 8 Arsenic (As) – Environmental levels: Fresh water: • generally below 10 µg/liter • near anthropogenic sources – 5 mg/liter • ground water average – 1-2 µg/liter • geology dependent – up to 3 mg/liter
回 Arsenic(As)- in usa: 8 EXPLANATION Alaska 10-50 ≥UsGS 5 Hawa
Assoc.Prof. TorOve Leiknes 9 Arsenic (As) – in USA:
Arsenic(As) Probability of Arsenic Exceeding 0.05 mg/ <59 Bangladesh 5-2090 20-45% 45=709 70-1009 No Data Geochemical map of Bangladesh As first measured in groundwater in 1993 Assoc Prof. TorOve Leiknes
Assoc.Prof. TorOve Leiknes 10 Arsenic (As) – Bangladesh: Geochemical map of Bangladesh: As first measured in groundwater in 1993