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Studies were carried out on dry ash of red mangrove (Rhizophora mangle L) bark, an agricultural waste, to determine the potassium ion concentration in it, by titratory and spectrophotometric methods. 100gm of the dry ash were dissolved in 500cm 3 distilled water and the aqueous extract from the bark subjected to titration against standard solutions of CH3COOH, HCl and H2SO4 in the concentration ranges of 0.52.0M,while AAS was carried out using 5gm of the dry ash in GBC Avanta flame atomic absorption spectrophotometer version 2.02 . The results obtained from the titration reaction revealed that there were high levels of potassium ion concentration (19.50 to 31.91gm/dm 3 and 21.52 to 37.0656gm/dm 3 ) in both HCl and H2SO4 solutions, but low in CH3COOH(14.82 to 18.13 gm/dm 3 ).This result was in agreement with the results of AAS result (18.255ppm). The percentage purity calculated revealed that the potassium ion obtained from the red mangrove bark aqueous extract (RMBAE) had a purity of 69.94%,showing high purity of the potassium obtained by these methods. The proposed methods were successfully employed to determine potassium ion concentration in red mangrove bark aqueous extract (RMBAE). The methods were very simple, inexpensive, less time consuming. environmentally friendly and reliable.

Determination of Potassium Ion Concentration in Red Mangrove (Rhizophora Mangle L) Barks Aqueous Extract (RMBAE) In Acid Media