A Practical Course in Agricultural Chemistry - download pdf or read online

By D. W. Gilchrist Shirlaw and J. E. Nichols (Auth.)

ISBN-10: 0080124607

ISBN-13: 9780080124605

Show description

Read Online or Download A Practical Course in Agricultural Chemistry PDF

Best science & math books

Signs of God, Design in Nature - download pdf or read online

Allow us to for a second reflect on an aspirin; you'll instantly keep in mind the mark within the center. This mark is designed to aid those that take a part dose. each product that we see round us, whether no longer so simple as the aspirin, is of a definite layout, from the cars we use to visit paintings, to television distant controls.

Ma verite sur la memoire de l'eau - download pdf or read online

« Jacques Benveniste restera l'homme d'une polémique. Dans laquelle il air of secrecy tout gagné. Et tout perdu. Jacques Benveniste n'avait pas toujours été un chercheur à half. Jusqu'à sa découverte contestée, il avait été l'un des scientifiques français les plus publiés en immunologie, sa spécialité de départ, et les plus appréciés.

Extra info for A Practical Course in Agricultural Chemistry

Sample text

30. THE DETERMINATION OF MAGNESIUM BY ATOMIC ABSORPTION Reagents required 1. A series of magnesium standards is required: 1, 2, 3, 4, 5 and 6 ppm. A concentrated standard is first prepared by carefully cleaning a strip of magnesium ribbon, weighing out 0-5 g and dissolving in 10 ml of normal hydrochloric acid; this is made up to 500 ml in a graduated flask with distilled water. From this concentrate a 100 ppm standard is prepared by diluting 10 ml to 100 ml with 0-5 normal acetic acid. T h e required standards are now prepared by diluting 1 ml of this solution to 100 ml with the acetic acid for every 1 ppm required.

Tintometer T H E ANALYSIS O F SOILS 37 Limited manufacture a colour standard disc for use in the Lovibond comparator; this is the basis of a field method. Reagents required 1. Buffer solution: This is prepared by dissolving two "Soloid" pH 6-99 buffer tablets in 300 ml distilled water. 2. Nitrazine yellow indicator: Since different batches of nitrazine yellow have different colours at a particular pH value, if the standard Tintometer disc is to be used, the nitrazine yellow should be that supplied by Tintometer.

10 ml of the soil extract and 10 ml of absorption buffer are pipetted into a test-tube and well shaken. 2. T h e series of standard solutions are prepared in a similar manner. 3. T h e atomic absorption apparatus is set as described in the maker's instructions. 4. Spray the standard solutions to obtain approximate readings. 5. Spray the unknown solutions and note the reading. 6. Spray the standard that most nearly approaches the concentration of the unknown and note the reading. 7. Check the reading of the unknown and that of the standard.

Download PDF sample

A Practical Course in Agricultural Chemistry by D. W. Gilchrist Shirlaw and J. E. Nichols (Auth.)


by Robert
4.3

Rated 4.30 of 5 – based on 50 votes