3. The affinity of major cations for soil surfaces typically follows this order: Na
Solution
3(a) Higher affinity of ions for soil surface indicates the greater possibility of its retention in the soil i.e., more tightly bound to the soil. This affinity generally increase with charge of ions and reduces with increase in hydrated ionic size. Thus introduction of higher concentration of sodium ion will not affect the composition of the soil much and will increase the sodium ion concentration in the pool water.
(b) Zinc cation is doubly positively charged. Its hydrated radius is much greater than Ca 2+ but slightly greater Mg 2+ . This would lead to similar soil affinity of zinc and magnesium cations. Thus affinity of soil for Zn 2+ is much greater than Na + . Thus there would be no effect of snowmelt water with high sodium concentration on affinity of Zn 2+ for soil.
.
3- The affinity of major cations for soil surfaces typically follows t.docx
1. 3. The affinity of major cations for soil surfaces typically follows this order: Na
Solution
3(a) Higher affinity of ions for soil surface indicates the greater possibility of its retention in the
soil i.e., more tightly bound to the soil. This affinity generally increase with charge of ions and
reduces with increase in hydrated ionic size. Thus introduction of higher concentration of sodium
ion will not affect the composition of the soil much and will increase the sodium ion
concentration in the pool water.
(b) Zinc cation is doubly positively charged. Its hydrated radius is much greater than Ca 2+
but
slightly greater Mg 2+
. This would lead to similar soil affinity of zinc and magnesium cations.
Thus affinity of soil for Zn 2+
is much greater than Na +
. Thus there would be no effect of
snowmelt water with high sodium concentration on affinity of Zn 2+
for soil.
