The addition of quartz sands could make water steam easy to pass through the rice powder in the extraction vessel. However, further experiments showed that the amount of added quartz sand would also affect the extraction efficiency (Song et al., 2012). Thus, the different mixed proportions were investigated from 1:0 to 1:3
(rice powder: quartz sand), the results were shown in Fig. 2b. It was indicated that the highest recoveries of the carbamates were obtained with the mixed proportion of 1:1. The excess addition of quartz sands would hinder the mass transfer of the carbamate pesticides from the sample, and resulted in the decrease of carbamate
pesticides recoveries. Hence, 1:1 was selected as the mixed proportion of sample and quartz sands in this work.
Table
The addition of quartz sands could make water steam easy to pass through the rice powder in the extraction vessel. However, further experiments showed that the amount of added quartz sand would also affect the extraction efficiency (Song et al., 2012). Thus, the different mixed proportions were investigated from 1:0 to 1:3(rice powder: quartz sand), the results were shown in Fig. 2b. It was indicated that the highest recoveries of the carbamates were obtained with the mixed proportion of 1:1. The excess addition of quartz sands would hinder the mass transfer of the carbamate pesticides from the sample, and resulted in the decrease of carbamatepesticides recoveries. Hence, 1:1 was selected as the mixed proportion of sample and quartz sands in this work.Table
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