extremely significantp < .01
The following correlations exist between the three toxic elements and the five nutrient elements: (a) very significant positive correlation (As & Cu, As & Zn, Cd & Ni, Cd & Cu, Cd & Zn, Cd & Se, all p < .01); (b) extremely significant negative correlation (As & Mn, p < .01, As & Ni, p < .01, As & Se, p < .05); and (c) Cr and 5 nutrients were extremely positively correlated at p < .01.