Initial situation Two drinking water treatment plants in Northern Bulgaria with laboratories accredited under BS EN ISO/IEC 17025 were using DR3900 spectrophotometers. The ? rst plant, Dunav EOOD, is located in the city of Razgrad. It delivers drinking water to 82 jurisdictions with a total population of 118,874 people. It has a self-monitoring programme to analyse trihalomethanes from 67 stations. The second plant, Water Supply and

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