The objectives of the research were to determine the heavy
metals in the vegetable samples in industrial wastewater irrigated areas.
Results of vegetables from Dar es Salaam were obtained using Wavelength
Dispersive X-Ray Fluorescence (WDXRF). The sample analyzer machine is equipped
with Rh anode tube with spot focus operating under vacuum conditions. The
operating voltages vary from 20 kV to 60 kV with a current from 50 mA to 5 mA.
The characteristic x-rays from the sample were collimated before arriving at
the analyzing crystal under a vacuum of 0.05mB and detected using a
proportional counter and NaI (Tl) x-ray detector biased at -1000V. The net peak
areas of the characteristic lines were determined using a non-linear least
square fitting procedure. The whole detection and crystal system was shielded
by a 10 mm lead shield. Analysis time ranged between 20-50 seconds for each
element and about 100s for the standard sample. Elements in the material range
from C, N, O, Na, Mg, Al, Si, P, S, Cl, K, Ca, Ti, Ni, Mn, Fe, Cu, Zn, Br, Rb,
and Sr. The values obtained are within range of those published as essential as
foodstuff.
Author(s) Details
Yusuf Ismail Ally
Koleleni
Department of Physics, University of Dar es Salaam, P. O.
Box 35063, Dar es Salaam, Tanzania and Department of Physics, Muslim University
of Morogoro, P. O. Box 1031, Morogoro, Tanzania.
Please see the book here:- https://doi.org/10.9734/bpi/mono/978-81-974388-4-4/CH3
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