Impact of Ag Nanoparticle Exposure on p,p鈥?/i>-DDE Bioaccumulation by Cucurbita pepo (Zucchini) and Glycine max (Soybean)
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- 作者：Roberto De La Torre-Roche ; Joseph Hawthorne ; Craig Musante ; Baoshan Xing ; Lee A. Newman ; Xingmao Ma ; Jason C. White
- 刊名：Environmental Science & Technology (ES&T)
- 出版年：2013
- 出版时间：January 15, 2013
- 年：2013
- 卷：47
- 期：2
- 页码：718-725
- 全文大小：334K
- 年卷期：v.47,no.2(January 15, 2013)
- ISSN：1520-5851
文摘
The effect of nanoparticle (NP), bulk, or ionic Ag exposure on dichlorodiphenyldichloroethylene (p,p鈥?/i>-DDE; DDT metabolite) accumulation by Glycine max L. (soybean) and Cucurbita pepo L. (zucchini) was investigated. The plants were grown in 125-mL jars of vermiculite amended with 500 or 2000 mg/L of bulk or NP Ag; ion controls at 5 and 20 mg/L were established. During 19 d of growth, plants were amended with solution containing 100 ng/mL of p,p鈥?/i>-DDE. Total shoot p,p鈥?/i>-DDE levels in non-Ag exposed G. max and C. pepo were 500 and 970 ng, respectively; total root DDE content was 13鈥?00 and 20鈥?00 ng, respectively. Ag decreased the p,p鈥?/i>-DDE content of G. max tissues by up to 40%, with NP exposure resulting in less contaminant uptake than bulk Ag. Total Ag content of exposed G. max ranged from 50.5 to 373 渭g; NP-exposed plants had 1.9鈥?.2 times greater overall Ag than corresponding bulk particle treatments and also significantly greater relative Ag transport to shoot tissues. Bulk and NP Ag at 500 mg/L suppressed DDE uptake by C. pepo by 21鈥?9%, although Ag exposure at 2000 mg/L had no impact on contaminant uptake. Similar to G. max, C. pepo whole plant Ag content ranged from 50.5 to 182 渭g, with tissue element content generally being greater for NP exposed plants. These findings show that the Ag may significantly alter the accumulation and translocation of cocontaminants in agricultural systems. Notably, the cocontaminant interactions vary both with Ag particle size (NP vs bulk) and plant species. Future investigations will be needed to clarify the mechanisms responsible for the cocontaminant interactions and assess the impact on overall exposure and risk.