An Alternative To Traditional TSS Analysis
ProWeighs Article

BOD- Glass vs. Plastic Bottles
Comparative Study on BOD Bottles

Total vs. Recoverable
A letter from EPA on the subject of Total Metals versus Recoverable Metals

The Chemistry of COD
Technical article on Chemical Oxygen Demand

Modified mTEC and e. Coli
Confused about how EPA Method 1603 and Modified mTEC?  Great article by a leading chemist