Effect of time interval of depuration on nutrients, heavy metals and microbial contents of periwinkles from Elechi creek, Rivers State, Nigeria
2024
Ojinnaka , M.C. | Okereke, A.N. | Ojimelukwe, P.C. | Ani, O.M. | Kanu, N.N. | Njoku, E.C. | Ochiogu, S.O. | Okereafor, O.C. | Onyejiuwa, N.C.
The present study investigated the effects of time interval of depuration on nutrients, heavy metals and microbial contents of periwinkles from Elechi creek using tap water. The physico-chemical parameters of the tap water used for depuration were also determined. There were decreases in the microbial populations from 0 h to 24 h depuration. The vibrio bacteria reduced from 0 h to 48 h (6.66 x107cfu/ml-1 to 1.16 x107cfu/ml-1). The faecal coliform bacteria were not detected (0.00 x102cfu/ml-1). The total heterotrophic bacteria was highest at 0 h depuration with 33.6 x107cfu/ml-1 but reduced to 3.43 x107cfu/ml-1 at 24h depuration process. The heavy metals (chromium, cadmium,lead) investigated were of lower values howeverlead and chromium were not detected from the depurated and non-depurated periwinkle samples. Cadmium contents were in the range of 0.97 – 0.11 mg/kg. The protein content of the periwinkle samples increased as the depuration time progressed (14.42 – 14.72%). The moisture content ranged from 81.41 – 82.28%. The results from the physico-chemical parameters showed that there were significant (P>0.05) increases in the pH (6.80 – 7.77), dissolved oxygen (4.82 – 5.89 mg/l) and salinity (4.28 – 5.72 mg/l) while the temperature decreased from 28.0 – 27.8oC. There were no turbidity values detected.
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