Fertilizer Analysis, Rapid Determination of Moisture in Ammonium Nitrate

Application of Thermistor Bridge Method to Determination of Water in Solids

“…This might permit accurate measurement of the colored complex in the presence of highly colored ions such as those formed by chromium, nickel, and cobalt, and thus eliminate the need for their removal. Smith (4) states that none of the common metals spoil the test, and Berger and Truog (1) state that the only known substance that is similar to boric acid in causing a color change with quinalizarin is germanic acid. The method of Berger and Truog was applied to low alloy steels with no separations (5).…”

Fertilizers

“…Apparatus for field sampling and laboratory assay of anhydrous ammonia was described (52). WATER Moisture in ammonium nitrate was determined rapidly through direct use of Karl Fischer reagent, with substitution of a volumetric measurement for analytical weighing of the sample (28). Alternatively (27), water was extracted with a stream of dry nitrogen and determined by the thermistor bridge-calcium hydride method (48).…”

“…Alternatively (27), water was extracted with a stream of dry nitrogen and determined by the thermistor bridge-calcium hydride method (48). Because extraction of water by nitrogen was incomplete, the method was calibrated against analvses made with Karl Fischer reagent (28).…”