ลำดับ	Parameter	วิธีวิเคราะห์
21	Volatile Suspended Solids (VSS)	Ignited at 550 °C
22	Volatile and Fixed Solids	Ignited at 550 °C
23	Mixed Liquor Suspended Solids (MLSS)	Dried at 103 – 105 °C
24	Mixed Liquor Volatile Suspended Solids (MLVSS)	Dried at 103 - 105 °C, Ignited at 550 °C
25	Settleable Solids	Volumetric Test
26	Sludge Volume Index	Dried at 103 - 105 °C, Volumetric Test
27	Sulfate	Turbidimetric Method
28	Sulfide	Iodometric Method
29	Surfactant	Colorimetric Method
30	Temperature	Laboratory and Field Method