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Potassium: A New Marker for Washed Cotton

U.S. Department of Agriculture, Agricultural Research Service, Southern Regional Research Center, New Orleans, Louisiana 70179, U.S.A.

Ralph J. Berni

U.S. Department of Agriculture, Agricultural Research Service, Southern Regional Research Center, New Orleans, Louisiana 70179, U.S.A.

Potassium salts are readily removed from raw cotton by washing the cotton with water. The potassium contents of cotton samples determined by ion-selective electrode, atomic absorption, and x-ray fluorescence methods confirmed that washed samples had low levels of potassium compared to unwashed samples. A sodium cobaltinitrite spot test for potassium is consistently positive for unwashed cotton samples and negative for washed cotton samples. Thus, the potassium content can serve as a marker for washed cotton.

Textile Research Journal, Vol. 54, No. 3, 210-214 (1984)
DOI: 10.1177/004051758405400312


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