Cobalt particulate matter

Former studies by Hodgson et al. (1963) showed that the removal of organic matter, which partly controls CEC, from soils might either increase or decrease adsorption of Cobalt. It is likely that several parameters which are commonly associated with the adsorptive properties of particulate matter do not depend the same way on the constitutive properties of the samples. Nevertheless, it is still difficult ... 

Nutritionally, the clovers are superior to grasses in protein and mineral content (particularly calcium, phosphorus, magnesimn, copper and cobalt), and their nutritive value falls less with age. Studies with white clover have shown that the rates of reduction in particle size and of movement of particulate matter from the rumen are more rapid than with grass. Sheep and cattle offered white clover as fresh forage con-smned 20 per cent more dry matter than from grass of the same metabolisable energy... 

Iron and manganese occur in a number of soil minerals. Sodium and chlorine (as chloride) occur naturally in soil and are transported as atmospheric particulate matter from marine sprays (see Chapter 10). Some of the other micronutrients and trace elements are found in primary (unweathered) minerals that occur in soil. Boron is substituted isomorphically for Si in some micas and is present in tourmaline, a mineral with the formula NaMg3AlgB3Sig027(0H,F)4. Copper is isomorphically substituted for other elements in feldspars, amphiboles, olivines, p5Toxenes, and micas it also occurs as trace levels of copper sulfides in silicate minerals. Molybdenum occurs as molybdenite (M0S2). Vanadium is isomorphically substituted for Fe or A1 in oxides, pyroxenes, amphiboles, and micas. Zinc is present as the result of isomorphic substitution for Mg, Fe, and Mn in oxides, amphiboles, olivines, and pyroxenes and as trace zinc sulfide in silicates. Other trace elements that occur as specific minerals, sulfide inclusions, or by isomorphic substitution for other elements in minerals are chromium, cobalt, arsenic, selenium, nickel, lead, and cadmium. 

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