Journal
JOURNAL OF INTEGRATIVE AGRICULTURE
Volume 14, Issue 9, Pages 1845-1854Publisher
ELSEVIER SCI LTD
DOI: 10.1016/S2095-3119(14)60926-6
Keywords
cadmium; rice cultivars; bioconcentration factor; species-sensitivity distribution; toxicity thresholds
Categories
Funding
- National Natural Science Foundation of China [41271490, 21077131]
Ask authors/readers for more resources
It is imperative to derive an appropriate cadmium (Cd) health risk toxicity threshold for paddy soils to ensure the Cd concentration of rice grains meet the food safety standard. In this study, 20 rice cultivars from the main rice producing areas in China were selected, and a pot-experiment was conducted to investigate transformation of Cd in paddy soil-rice system with 0 (CK), 0.3 mg kg(-1) (T1) and 0.6 mg kg(-1) (T2) Cd treatments in greenhouse. The results showed that Cd concentrations of rice grains existed significant difference (P<0.05) in 20 rice cultivars under the same Cd level in soil. The Cd concentrations of rice grains of the CK, T1 and T2 treatments were in the range of 0.143-0.202, 0.128-0.458 and 0.332-0.806 mg kg(-1), respectively. Marked differences of the ratios of Cd concentration for soil to rice grain (BCFs) and transfer factors (TFs, root to grain and straw to grain) among the tested cultivars were observed in this study. The bioconcentration factors (BCFgrain) and TFs of the 20 rice cultivars were 0.300-1.112 and 0.342-0.817, respectively. The TFs of Cd from straw to grain ranged from 0.366 to 1.71, with significant differences among these 20 rice cultivars. The bioconcentration factors (BCFgrain) and TFs among the 20 rice cultivars ranged from 0.300-1.112 and 0.342-0.817, respectively. The species-sensitivity distribution (SSD) of Cd sensitivity of the rice species could be fitted well with Burr-III (R-2=0.987) based on the data of BCFs. The toxicity threshold of Cd derived from SSD for the paddy soil was 0.507 mg kg(-1) in the present study.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available