Colorimetry Indicator Articles & Analysis
2 articles found
pH is a principal indicator of changing water chemistry in lakes and reservoirs. The pH scale ranges from 0 to 14, with values below 7 indicating acidity and values above 7 indicating alkalinity. A stable pH reading does not always reflect stable chemistry in surface waters, where inflows, sunlight, temperature, and biological activity drive rapid changes. During productive periods, shifts can ...
Ash from pig manure treated by combustion and thermal gasification was characterized and compared in terms of nutrient, i.e., potassium (K), phosphorus (P) and heavy metal, i.e., cadmium (Cd), chromium (Cr), copper (Cu), nickel (Ni) and zinc (Zn) contents. Total nutrient and metal concentrations were measured using energy dispersive X-ray fluorescence analysis. Acid (HNO3, H2SO4) and ...