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This study was designed to evaluate the adsorption‐desorption hysteresis of endosulfan (1,2,3,4, 7,7‐hexachlorobicyclo[2,2,1]‐2‐heptene‐5,6‐bisoxymethylene sulfite) in selected tropical soils. Two major tropical soils from Thailand were selected, Rangsit lowland soils (Rangsit series) and Phrabat upland soils (Pakchong series). The soil types were sub‐divided into plow soils, 0–20cm depth from the surface, and subsoils, 20–40cm depth. Adsorption was determined in 24h batch equilibrium, with five different concentrations of 14C endosulfan ranging from 1.04 to 16.64 ng/mg soils. Four successive desorption studies were performed continuously after three adsorption concentrations, 24h for each successive. Adsorption coefficient values (K ads) as determined by Freundlich model ranged from 0.02 to 0.14 and found to be higher in Rangsit soils as expected when compared with Phrabat soils. Desorption was hysteresis in every desorption study. Desorption coefficient values (K des) were higher than adsorption (K des). 相似文献
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Theera Tongsong Pimlak Charoenkwan Pannee Sirivatanapa Chanane Wanapirak Wirawit Piyamongkol Supatra Sirichotiyakul Kasemsri Srisupundit Fuanglada Tongprasert Suchaya Luewan Thawalwong Ratanasiri Ratana Komwilaisak Piyamas Saksiriwuttho Chutawadi Vuthiwong Peerapun Punpuckdeekoon Prisana Panichkul Wibool Rueangchainikhom Jirawat Choowong Nawaporn Orungrote Sravuth Sarapak Ekachai Kovavisarach Prapon Jaruyawongs Thitinan Tansathit Podjanee Phadungkiatwattana Jittima Rujiwetpongstorn Ounjai Kor-anantakul Chitkasaem Suwanrath Tharangrut Hanprasertpong Savitree Pranpanus 《黑龙江环境通报》2013,33(5):477-483
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