• Wang, MHS and Wang, LK (2021). Microwave-assisted analytical methods for rapid solids and water content determination. In: “Environmental Science, Technology, Engineering, and Mathematics (STEM)”, Wang, LK, Wang, MHS, and Pankivskyi, YI (editors). Volume 2021, Number 11, November 2021; pp.31. Lenox Institute Press, Auburndale, Massachusetts,USA. ……ABSTRACT: The authors introduce the microwave-assisted methods as a stepping-stone of environmental research, hoping that (a) operators may use the microwave-assisted methods as the supplemental analytical methods for analyzing the TS, TSS, TDS, and WC under urgent situations and with a standard operating procedure (SOP) for the microwave oven to be used; (b) researchers may develop more similar microwave-assisted technologies for various environmental applications; (c) this microwave-assisted solids and water content methods may one day become a part of the Standard Methods; and (d) the laboratory equipment manufacturers are willing to produce high quality, programmable, and temperature controllable microwave facilities for environmental applications in the near future. Current Standard Methods are: (a) Method 2540B TS dried at 103-105 oC; (b) Method 2540C TDS dried at 180 oC; and Method 2540D TSS dried at 103-105 oC. The Standard Methods allows a material balance calculation among the three solids (TS = TSS + TDS) if two solids are known. The authors suggest that the testing temperatures for the three closely related solid tests, (TS, TSS, and TDS) be consistent, either all 103-105 oC, or all 180 oC, in order to avoid any errors.