Stationary phases phthalate esters

The technique was further improved by employing a polymer coating on the polymeric fibers packed in a fused silica capillary. The coating material was based on GC stationary phases. The polymer-coated fiber-packed capillary was used as the sample loop of the LC injection valve for the extraction of phthalate esters from river water and wastewater.22 The coated-fiber extraction capillaries demonstrated a better extraction efficiency and lower limit of quantification (LOQ) than the uncoated-fiber capillaries. Also, the coated fibers were similarly packed in a PEEK tube, which was used as the injection loop or integrated in the rotor of an LC injection valve employed for the extraction of phthalates. The results clearly showed that an extraction with high selectivity could be established with an appropriate type of polymer coating.23... 

Dibutyl phthalate, also tritolyl phosphate or Silicone oils KF96 and DC703 (Dow Corning) as stationary phases with helium as the carrier gas have been used to separate silicon tetrachloride and phosphorus trichloride in trichlorosilane380,381. The esters vitiated results due to the production of hydrogen chloride by hydrolysis of the sample. 

Burson and Kennerfound that the dimethyl-, diethyl- and dibutyl-phthalates were the most effective of the phthalate ester stationary phases in making complete separations of chlorosilanes and methylchlorosilanes. The maximum temperature for these three phases is less than lOO C and, consequently, considerable column bleed is evident when the program nears this temperature. Dinonyl-phthalate has a higher temperature limit, but is not so effective in resolving the methyltrichlorosilane and dimethyldichlorosilanes. Dipropyltetrachlorphthalate is even less effective. 

Fluorinated compounds were chromatographed on dinonyl phthalate (28), dioctyl phthalate (29), fluorinated esters (30), and silicones (30) as stationary phases. 

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