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| Extraction method of available cadmium in tea garden soil |
| Received:June 07, 2021 |
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| KeyWord:tea;soil;available cadmium;extractant;method optimization |
| Author Name | Affiliation | E-mail | | LI Haitao | Tea Research Institute of Chinese Academy of Agricultural Sciences, Key Laboratory for Tea Plant Biology and Resource Utilization, Ministry of Agriculture and Rural Affairs, Hangzhou 310008, China
Graduate School of Chinese Academy of Agricultural Sciences, Beijing 100081, China | | | YANG Liu | Tea Research Institute of Chinese Academy of Agricultural Sciences, Key Laboratory for Tea Plant Biology and Resource Utilization, Ministry of Agriculture and Rural Affairs, Hangzhou 310008, China
Graduate School of Chinese Academy of Agricultural Sciences, Beijing 100081, China | | | FANG Li | Tea Research Institute of Chinese Academy of Agricultural Sciences, Key Laboratory for Tea Plant Biology and Resource Utilization, Ministry of Agriculture and Rural Affairs, Hangzhou 310008, China | | | NI Kang | Tea Research Institute of Chinese Academy of Agricultural Sciences, Key Laboratory for Tea Plant Biology and Resource Utilization, Ministry of Agriculture and Rural Affairs, Hangzhou 310008, China | | | SHI Yuanzhi | Tea Research Institute of Chinese Academy of Agricultural Sciences, Key Laboratory for Tea Plant Biology and Resource Utilization, Ministry of Agriculture and Rural Affairs, Hangzhou 310008, China | shiyz@tricaas.com |
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| Abstract: |
| Precise determination of available cadmium in tea plantation soil is of great significance for risk assessment of the cadmium content in tea shoots and remediation of contaminated soil. To select a suitable extractant for available cadmium in tea plantation soil and to optimize the extraction method, 62 soil samples and relevant tea shoot samples were collected from Pu'er, Lishui, and Shengzhou. The extraction effects of five extractants, namely 0.1 mol·L-1 CaCl2, 0.1 mol·L-1 HCl, 1 mol·L-1 NH4OAc, 1 mol·L-1 MgCl2, and 0.005 mol·L-1 DTPA were compared. We then compared and optimized four factors, namely the extractant concentration, ratio of soil to solution, extraction time, and oscillation frequency. The results showed that the extraction rate of different extractants was 0.1 mol·L-1 HCl>1 mol· L-1 MgCl2>0.005 mol·L-1 DTPA>0.1 mol·L-1 CaCl2>1 mol·L-1 NH4OAc. The correlation coefficient between the available cadmium content and tea shoot cadmium content was in the order of 1 mol·L-1 NH4OAc>0.1 mol·L-1 CaCl2>0.1 mol·L-1 HCl>1 mol·L-1 MgCl2>0.005 mol· L-1 DTPA. The extractant concentration and extraction time had a significant influence on the extraction efficiency of available cadmium, whereas the oscillation frequency and ratio of soil to solution had less influence. The results showed that NH4OAc was the best extractant of available cadmium in tea plantation soil. The best extraction conditions were 6 mol·L-1 NH4OAC, 1∶10 ratio of soil to solution, 120 min extraction time, and 180 r·min-1 oscillation frequency. |
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