عدد المساهمات : 106 نقاط : 318 تاريخ التسجيل : 16/01/2012
موضوع: Biological oxygen demand test الأربعاء مايو 23, 2012 11:08 pm
The biological oxygen demand test is a two-part test. Two water samples are taken at the same time. Dissolved oxygen is measured in the first sample right away. The second sample is shielded from light and measured at a later time. The amount of oxygen in the first and second samples is compared to find out how much oxygen was used by bacteria as they decompose organic material
الرئيسية 
