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APHA
SMWW 3500-K
Potassium
2023
3
Standard methods for the examination of water and wastewater (543.3 APHA 24th ed. Ref. Treatises&monographs FL2)
Potassium (K) is the fourth element in Group IA of the periodic table. It has an atomic number of 19, an atomic weight of 39.10, and a valence of 1. The average abundance of K in the earth’s crust is 1.84%; in soils it has a range of 0.1 to 2.6%; in streams it is 2.3 mg/L, and in groundwaters it has a range of 0.5 to 10 mg/L. Potassium is commonly associated with aluminosilicate minerals such as feldspars...