Masakorala Kanaji, Turner Andrew, Brown Murray T
School of Earth, Ocean and Environmental Sciences, University of Plymouth, Drake Circus, Plymouth PL48AA, UK.
Environ Pollut. 2008 Dec;156(3):897-904. doi: 10.1016/j.envpol.2008.05.030. Epub 2008 Jul 17.
Uptake of Pd, Cd and Pb by the marine macroalga, Ulva lactuca, has been studied in the presence of an anionic (sodium dodecyl sulphate, SDS), cationic (hexadecyltrimethylammonium bromide; HDTMA) and non-ionic (Triton X-100; TX) surfactant. Compared with the surfactant-free system, metal sorption was reduced in the presence of SDS or TX. Neither surfactant, however, had any measurable impact on cell membrane permeability, determined by leakage of dissolved free amino acids (DFAA), or on metal internalisation. We attribute these observations to the stabilisation of aqueous Cd and Pb by SDS and the shielding of otherwise amenable sorption sites by TX. Presence of HDTMA resulted in a reduction in the extent of both sorption and internalisation of all metals and a significant increase in the leakage of DFAA. Thus, by enhancing membrane permeability, HDTMA exerts the greatest influence on metal behaviour in the presence of U. lactuca.
在阴离子表面活性剂（十二烷基硫酸钠，SDS）、阳离子表面活性剂（十六烷基三甲基溴化铵；HDTMA）和非离子表面活性剂（吐温X-100；TX）存在的情况下，研究了海洋大型藻类石莼对钯、镉和铅的吸收情况。与无表面活性剂体系相比，在SDS或TX存在时，金属吸附量减少。然而，这两种表面活性剂对由溶解的游离氨基酸（DFAA）泄漏所测定的细胞膜通透性或金属内化均无任何可测量的影响。我们将这些观察结果归因于SDS对水溶液中镉和铅的稳定作用以及TX对原本易于吸附的位点的屏蔽作用。HDTMA的存在导致所有金属的吸附和内化程度降低，以及DFAA泄漏显著增加。因此，通过提高膜通透性，HDTMA在石莼存在的情况下对金属行为产生最大影响。
