Fig. 1From: Evaluation of the effects of mandarin (Citrus reticulate) by-products containing citric acid on immobilization of cadmium in arable soilsChanges in concentrations of all carbonates in control, citric acid, and mandarin by-product amended soils after incubation at 25 °C for 6 weeks; different letters on error bars indicate significant differences; p = 0.05Back to article page