Are Crop And Range Lands Being Contaminated
With Cadmium And Lead In Sediments
Transported By Wind From An Adjacent
Contaminated Shallow Lake?
Author(s)
H. O. Rubio, T. R. Saucedo, M. R. Bautista, K. Wood,
C. Holguin & J. Jiménez
Abstract
Soil contamination by cadmium (Cd) and lead (Pb) in range and crop lands can
occur from polluted sediments carried by the wind. Soils samples were obtained
in three different areas on the leeward (east) side of a shallow lake called the
Laguna de Bustillos: (1) sediment in the shallow lake (S), (2) soil in the range
area adjacent to the shallow lake (RA), and (3) soil in agriculture land (AL)
adjacent to the range area. In each area, three composite soil samples were
randomly collected at depths of 0-15, 15-30 and 30-50 cm. Therefore, 45 soil
samples were analyzed as a 3 (area) x 3 (depth) factorial arrangement. The
samples were air dried, passed through a 2.0 mm sieve, ground and passed
through a 0.355 mm sieve, and digested with concentrated nitric acid. The metals
Cd and Pb were determined using ICP optical emission spectrometry. In addition
pH and CE were evaluated. Cadmium concentration was statistically different
among areas and showed a strong interaction between depth x area. Maximum
Cd concentration was found in S with 0.94 mg kg-1 in the surface horizon (0-15
cm). Lead concentration was different among areas and the interaction was not
as strong as the one noted for Cd. Highest Pb concentrations were observed in
the surface horizons (0-15 cm) of both S and RA with 74.19 mg kg-1 and 55.09
mg kg-1. Nevertheless, for the AL system the maximum Pb concentration was
found in the subsurface horizon (30-50 cm) with 40.23 mg kg-1. It is concluded
that Cd and Pb are contaminating the RA and AL through wind movement with
Pb contamination being the worst.
Keywords: cadmium, lead, soil contamination, laguna Bustillos, Chihuahua,
México.
Keywords
cadmium, lead, soil contamination, laguna Bustillos, Chihuahua,
México.
Related Book
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