Processing Environmental Samples Containing Organic Chemicals Using Polymeric Microfilters
2000
Xing, Baoshan
This paper describes a study to determine the sorption of five herbicides and three organic contaminants by five polymeric microfilters. The five filters had different membrane and housing makeups: (i) nylon-polypropylene (NY-PP), (ii) borosilicate glass-acrylic (BA-AC) (iii) polyethersulfone-acrylic (PS-AC), (iv) polyvinylidene difluoride-polypropylene (PV-PP), and (v) PTFE-polypropylene (PT-PP). The herbicides were isoxaflutole, diketonitrile, atrazine, metolachlor, and 2,4-D; the contaminants were trichloroethylene, α-naphthol, and phenanthrene. All five filters strongly sorbed the eight chemicals (except for three filters for 2,4-D) and sorption was largest at the first passage and declined with the increasing number of passages. The first passage sorption of isoxaflutole followed a decreasing order: PV-PP (92%) > BA-AC (87%) > PS-AC (42%) > PT-PP (38%) > NY-PP (26%); diketonitrile: BA-AC (69%) > PV-PP (22%) > PS-AC (18%) = NY-PP (18%) > PT-PP (12%); metolachlor: BA-AC (76%) ≥ PV-PP (75%) > PT-PP (32%) > PS-AC (23%) = NY-PP (23%); atrazine: BA-AC (78%) > NY-PP (24%) > PS-AC (19%) ≥ PT-PP (17%) ≥ PV-PP (15%); 2,4-D: NY-PP (22%) > PV-PP (7.8%) > BA-AC (1.4%) ≥ PS-AC (0.99%) ≥ PT-PP (0.41%); trichloroethylene: BA-AC (86%) > PS-AC (35%) > PV-PP (18%) ≥ NY-PP (16%) ≥ PT-PP (15%); α-naphthol: BA-AC (99%) = NY-PP (99%) > PV-PP (49%) = PS-AC (49%) > PT-PP (6.8%); and phenanthrene: PV-PP (99%) = PS-AC (99%) = NY-PP (99%) = BA-AC (99%) > PT-PP (42%). These filters are not suitable for preparing and processing environmental samples involving these eight chemicals (except for three filters for 2,4-D) unless some corrected measures are taken.
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