scholarly journals Bioaccumulation and Phytotoxicity and Human Health Risk from Microcystin-LR under Various Treatments: A Pot Study

Toxins ◽  
2020 ◽  
Vol 12 (8) ◽  
pp. 523 ◽  
Author(s):  
Lei Xiang ◽  
Yan-Wen Li ◽  
Zhen-Ru Wang ◽  
Bai-Lin Liu ◽  
Hai-Ming Zhao ◽  
...  

Microcystin-LR (MC-LR) is prevalent in water and can be translocated into soil-crop ecosystem via irrigation, overflow (pollution accident), and cyanobacterial manure applications, threatening agricultural production and human health. However, the effects of various input pathways on the bioaccumulation and toxicity of MCs in terrestrial plants have been hardly reported so far. In the present study, pot experiments were performed to compare the bioaccumulation, toxicity, and health risk of MC-LR as well as its degradation in soils among various treatments with the same total amount of added MC-LR (150 μg/kg). The treatments included irrigation with polluted water (IPW), cultivation with polluted soil (CPS), and application of cyanobacterial manure (ACM). Three common leaf-vegetables in southern China were used in the pot experiments, including Ipomoea batatas L., Brassica juncea L., and Brassica alboglabra L. All leaf vegetables could bioaccumulate MC-LR under the three treatments, with much higher MC-LR bioaccumulation, especially root bioconcentration observed in ACM treatment than IPW and CPS treatments. An opposite trend in MC-LR degradation in soils of these treatments indicated that ACM could limit MC-LR degradation in soils and thus promote its bioaccumulation in the vegetables. MC-LR bioaccumulation could cause toxicity to the vegetables, with the highest toxic effects observed in ACM treatment. Similarly, bioaccumulation of MC-LR in the edible parts of the leaf-vegetables posed 1.1~4.8 fold higher human health risks in ACM treatment than in IPW and CPS treatments. The findings of this study highlighted a great concern on applications of cyanobacterial manure.

2019 ◽  
Vol 20 (2) ◽  
pp. 499-507 ◽  
Author(s):  
Qiao Zhang ◽  
Sheng Yang ◽  
Bangmi Xie ◽  
Jian Zhang ◽  
Chen Deng ◽  
...  

Abstract The occurrence, distribution, ecological and health risk assessment of five antibiotics (CFM, ERY, LCM, SMD and SMX) in 32 drinking water reservoirs of a megacity (Shenzhen) in Guangdong–Hong Kong–Macao Greater Bay Area (GBA), were investigated. Among the above antibiotics, CFM was not detected, ERY, SMD, LCM and SMX were detected in 65.6%, 46.9%, 43.7% and 40.6% of samples, with concentrations of 1.594–7.605 ng·L−1, 0.335–6.695 ng·L−1, 0.288–7.878 ng·L−1 and 0.770–5.355 ng·L−1, respectively. The maximum concentration of ERY was detected in GT Reservoir, and those of the other 3 antibiotics were detected in SZ Reservoir. The ecological risk quotient (RQ) values for SMX in SZ, XL, YT, EJ, SY, TG, XK, GK, MK and GT reservoirs ranged from 0.1 to 1.0, indicating a median risk to aquatic organisms, the others posed insignificant risk or low risk. Considering the joint effects of detected antibiotics, the highest overall RQ value was 0.38, obtained in SZ Reservoir, in other words, it was exposed to greater risk. Based on health risk assessment, the health RQ values for the detected antibiotics were significantly lower than 0.01, indicating insignificant risk to human health. These findings could provide a scientific basis for the government to ensure the drinking water safety of a megacity in GBA.


2006 ◽  
Vol 14 (2) ◽  
pp. 559-570 ◽  
Author(s):  
F. Quercia ◽  
A. Vecchio ◽  
M. Falconi ◽  
L. Togni ◽  
E. Wcislo ◽  
...  

Author(s):  
Quang Phan Dinh ◽  
Sylvester Addai‐Arhin ◽  
Huiho Jeong ◽  
Willy Cahya Nugraha ◽  
Pham Hung Viet ◽  
...  

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