Agricultural & Natural Resources Development Home Page | Land Reclamation Home Page | Effect of Digestion Method, Siderite Content, and Fizz Rating on Neutralization Potential of Overburden Samples
Table 1. Steps used in determining NP by four
digestion methods1. 
Steps Sobek BOIL H3O2 SobPer
______________________________________________________________________________________________________
1. Add acid. Add acid. Add acid. Add acid.
2. Heat (without Add water Add water Heat (without) boiling) until to 100 ml. to 100 ml. boiling) until bubbling stops. bubbling stops.
3. Add water Boil 5 min. Boil 5 min. Add water to 100 ml. to 100 ml.
4. Boil 1 min. Cool & titrate Filter. Boil 1 min. to pH 7.
5. Cool & titrate Add 5 ml of Cool & titrate to pH 7. 30% H2O2. to pH 7.
6. Boil 5 min. Add 5 ml of 30% H2O2.
7. Cool & titrate Boil 1 min. to pH 7.
8. Cool & titrate to pH 7. Add more H2O2 and re-titrate if necessary.
______________________________________________________________________________________________________
1All analyses were determined on a 2-g sample of <60 mesh particle size.
