Aquatic tests Sturm test

In the presence of suspended natural populations from unpolluted aquatic systems, the second-order microbial transformation rate constant determined in the laboratory was reported to be 4.2 + 0.7 X 10 L/organism-h (Steen, 1991). Using the modified Sturm test, >80% of bis(2-ethylhexyl) phthalate mineralized to carbon dioxide in 28 d (Scholz et al., 1997). 

Step 2 Determination of the biodegradability under the same conditions that predominate in the environment for the intended application, e.g., modified Sturm test for applications in aquatic ecosystems and soil degradation test for applications in agriculture. 

Handbook of Biodegradable Polymers, 2nd Edition 5.3.2 Aquatic, Aerobic Biodegradation Tests 5.3.2.1 Based on Carbon Conversion ( Sturm Test)... 

Besides the Sturm test another much used aquatic, aerobic biodegradation test is ISO 14851 - Determination of the ultimate aerobic biodegradability of plastic materials in an aqueous medium - Method by measuring the oxygen demand in a closed respirometer. 

Besides the Sturm test another frequently cited aquatic, aerobic biodegradation test is the ISO 14851 [14], in parallel developed by the same working group ISO TC 61/SC 5/WG 22 and also published in 1999. 

Several other norms for aquatic, aerobic biodegradation tests have been published as well but are not frequently used for biodegradable polymers. Mostly the conditions of incubation (mineral medium, inoculum, temperature, concentration, etc.), are identical or at least similar to the Sturm and MITI methods. The differences lie in the parameters that are being measured and the method for calculating the biodegradation. The following different tests can be used ... 

---