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Twelve portions of samples above mentioned were added into 50mL colorimetric tubes, 10.0g of each sample was weighed. Then they were divided into 6 groups. The final series of concentrations of the samples were 0, 5.0, 10.0,20.0, 50.0, and 100.0 mg kg-1(2 parallel per sample). At the same time, the same method above was also employed with S. The results for the determination of O in these samples were listed in Table 1. From Table 1 we concluded that a good agreement between U and S when the content of sample was below 20.0 mg kg-1, however, the results of U were superior to those of S when the contents were above 20.0 mg kg-1.

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Twelve portions of simulation soil standard samples above mentioned were added into 50mL colorimetric tubes, 5.0000g of each sample was weighed. Then they were divided into 6 groups. The final series of concentrations of the simulation soil standard samples were 0, 5.0, 10.0, 25.0, 50.0, and 100.0 mg kg-1(2 parallel per sample). At the same time, the same method above was also employed with Soxhlet extraction. The results for the determination of petroleum oils in these simulation soil standard samples were listed in Table 1. From Table 1 we concluded that a good agreement between ultrasonic solvent extraction and Soxhlet extraction when the content of simulation soil standard sample was below 25.0 mg kg-1, however, the results of ultrasonic solvent extraction were superior to those of Soxhlet extraction when the contents were above 25.0 mg kg-1.

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6Â¥2012-06-12 07:48:29
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qhd511: ½ð±Ò+35, ·­ÒëEPI+1, ¡ï¡ï¡ï¡ï¡ï×î¼Ñ´ð°¸, ¸ÐлÄúµÄÐ޸ģ¬Éî±í¸Ðл£¡ 2012-06-12 09:00:57
Add 5.0000g each simulation soil standard sample mentioned above and petroleum oil standard solutions into 50mL colorimetric tubes to make final simulation soil standard samples with concentrations of 0, 5.0, 10.0, 25.0, 50.0, and 100.0 mg.kg-1(2 parallel samples per concentration). The final simulation soil standard samples were then treated with ultrasonic solvent extraction and Soxhlet extraction and petroleum oils in these simulation soil standard samples were determined thereafter. The results of petroleum oils in these simulation soil standard samples were listed in Table 1 and it can be concluded that similar extraction effects can be achieved through both ultrasonic solvent extraction and Soxhlet extraction methods when the concentrations of simulation soil standard sample was below 25.0 mg.kg-1 while the extraction effects of ultrasonic solvent extraction were better than those of Soxhlet extraction when the concentrations were above 25.0 mg kg-1.¼´Ê¹Äã¸Ä¹ýµÄÖÐÎÄ»¹ÊÇÈÃÈ˲»Ì«Ã÷°×£¡Ôõô¼ÓÑùÁ¿ÓÖ³É5gÁË£¿Äãµ½µ×Ôõô×öµÄ£¿ÒÔÉÏ·­ÒëÊǰ´ÎÒÀí½â۵ģ¬Äã¿´¿´ÊÇ·ñ·ûºÏ±¾À´ÃæÃ²¡£ÓÐÎÊÌâÔÙ˵°É
7Â¥2012-06-12 07:53:51
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