Factors In The Determination Of Calcium Copper Iron Sodium And Phosphorus In Some Ecological Materials

The effects of heating temperature, time andacid-mixture in the determination of calcium, Copper,Iron, Sodium and phosphorus in some soil and plantsamples by wet-digestion using Atomic absorptionspectrophotometer, flame photometer and UV spectrophotometerhave been studied. The values of Iron and Sodiumobtained tend to increase with increase in temperature,while calcium and phosphorus show a decrease withincrease in the digestion temperature. The copper valuesappear essentially independent of the heating temperaturewithin the range studied. A comparative analysis by dryashing at two temperatures agrees with the above trends.Perchloric-nitric acid mixture gave the highestvalues for calcium and phosporus while the highest valuesof sodium were obtained using nitric-sulphuric acidmixture at the same temperature. The values of copperand Iron obtained were not significantly affected bythe change in acid mixture. The values of sodiumobtained by Atomic Absorption in the presence of anionization buffer were comparable to those obtained bythe flame emission technique.It is suggested that the use of the same digestsolution to determine several minerals, as is oftendone, may lead to errors, and optimum conditions shouldbe determined for each mineral in accurate analysis.

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