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Assessment of alkaline content and heavy metals in some agro-waste obtained from Pauta farmlands, Kaduna State

Author Affiliations

  • 1Nigerian Defence Academy, Kaduna, Nigeria
  • 2Chemistry Department, Nigerian Defence Academy, Kaduna, Nigeria

Res.J.chem.sci., Volume 8, Issue (3), Pages 16-21, March,18 (2018)


The study was carried out to assess the level of heavy metals (Cd, Cr Mn, Fe, Zn,), alkali metals (K, Na, Ca) and potash (KOH, K2CO3) contents in Agro waste products produced in Pauta area of Igabi Local Government Area Kaduna north using Atomic Absorption Spectrophotometer (AAS), Flame photometer and titrimetric methods. The mean concentrations determined across the samples were given as follows: For the beans Husk, groundnut husk, guinea corn husk, rice husk and millet husk, Mn (5.013-26.345 mg/kg), Fe (3.548-8.757 mg/kg), Zn (1.459-2.118 mg/kg), Cd (0.005-0.013 mg/kg), Pb (0.092-0.181 mg/kg), Cr (0.108-0.400 mg/kg). The mean concentrations of Mn, Fe and Cr obtained in the Agro waste samples were higher compared to the safety limits recommended by Food and Agricultural Organization/World Health Organization, (2006) with the exception of Zn and Cd which showed a lower level. The results for the concentration of trace elements in the samples varied between ranged Ca (40.711-80.265 mg/kg), K (1.3-8.9 mg/kg), and Na (2.5-5.3 mg/kg). It has been observed that groundnut husk (GHS) has higher concentration of calcium than its counterparts. All the Agro waste samples analysed for trace metals were below the limit recommended by Health Canada, (2006). The calculated percentage yield of KOH (43.62%) and K2CO3 (79.62%) in all the Agro waste products of were significant. Therefore, the results above obtained for all the parameters suggest that these Agro wastes products are safe for potash production and for related agricultural, domestic and industrial uses since the heavy metal and trace metal contents of most of the samples analysed are within acceptable or safe limit while the alkaline content is also rich enough.


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