Study on the Behavior and Removal of Cadmium and Zinc Using Taraxacum officinale and Gazania under the Application of Biodegradable Chelating Agents

• Published in: Applied sciences Vol. 11; no. 4; p. 1557
• Main Authors: Kano, Naoki, Hori, Takumi, Zhang, Haixin, Miyamoto, Naoto, Anak, David Eva Vanessa, Mishima, Kenji
• Format: Journal Article
• Language: English
• Published: Basel MDPI AG 01.02.2021
• Subjects: Acids; Adsorption; Biodegradability; biodegradable chelating agent; Biodegradation; Cadmium; Chelating agents; Chelation; Control systems; Environmental control; Experiments; Gazania; Heavy metals; Humidity; Inductively coupled plasma mass spectrometry; Mass spectrometry; Mass spectroscopy; metal recovery; Metals; Nitric acid; one-way ANOVA; Phytoremediation; Plant extracts; Pollution; Relative humidity; Soil contamination; Soil investigations; Statistical analysis; Taraxacum officinale; Variance analysis; Zinc; Japan
• ISSN: 2076-3417; 2076-3417
• DOI: 10.3390/app11041557

The removal of cadmium (Cd) and zinc (Zn) from soil by phytoremediation was investigated using Taraxacum officinale and Gazania. A plant environmental control system was used to cultivate the plants. The effects of different biodegradable chelating agents (i.e., EDDS, HIDS, and GLDA), relative humidity, and other competitive metals on the adsorption of Cd and Zn were also studied. In addition, the approach for metal recovery was explored by extraction of metals from plants after phytoremediation using Gazania. The concentrations of Cd and Zn were determined by inductively coupled plasma mass spectrometry (ICP-MS). In addition, one-way analysis of variance (ANOVA) tests were performed.to determine significant differences between the experimental treatments adopted in this work. Consequently, the following main conclusions were obtained: (1) In the case of Taraxacum officinale, Cd and Zn could be removed even under the presence of other heavy metals. (2) By adding a chelating agent, the amount absorbed by the shoot generally increased. (3) In the case of Gazania, the concentration of Cd was higher in root than that in shoot, whereas the concentration of Zn was higher in the shoot than that in the root. (4) Taraxacum officinale was more suitable for phytoremediation of Cd than Gazania. (5) Cd and Zn could be extracted from plants by adding a low concentration of nitric acid. (6) The one-way ANOVA tests showed no statistically significant differences among the experimental treatments.