University of Cambridge > Talks.cam > Department of Geography - main Departmental seminar series > Arsenic Levels in Drinking Waters of Emet-Kütahya – Turkey and its Relation to Arsenic Bearing Minerals in Borate Deposits.

Arsenic Levels in Drinking Waters of Emet-Kütahya – Turkey and its Relation to Arsenic Bearing Minerals in Borate Deposits.

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  • UserEmeritus Professor Nazmi Oruc (Environmental Protection Association, Eskişehir-Turkey)
  • ClockSaturday 25 April 2009, 16:15-17:30
  • HouseRoom R5 Emmanuel College.

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The largest colemanite reserves occur around the Emet Town which is located in the midwest of the Anatolia. Two natural spring water sources (Malı 1 and Malı 2) were supplied to the town (population of 20 000) about 18 years ago.

Source Sample size Min. Max. Med. MCL
Malı 1. (n=8) 150 634 448 50(1984)
Malı 2. (n=9) 48 633 384 10(1997)

Arsenic Levels (microgram/L)

The above results indicated that these two natural water sources contained much higher levels of arsenic than MCL set in Turkey. In 1997 the MCL was lowered to 10 microgram/L, from the 50 microgram/L, standard established in 1984. Hence, use of these waters was prohibited on Oct. 2001. It was reported in the literature that geochemical examinations of the Emet borate deposits contained As and S bearing minerals such as: realgar (AsS) and orpiment (As2S3) as scattered nodules in the colemanite formations. Consequently high levels of As in the natural waters were considered to be associated with the dissolution of these minerals occurring in the Emet water catchment area.

This talk is part of the Department of Geography - main Departmental seminar series series.

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