Because we did not separate matrix from the analytes, unwanted matrix could coelute
with analytes of interest, causing ion suppression.
Hence, some unknown substances in the plastic containers that coelute
with PCB retention time may have elevated the PCB levels.
Solutes that coelute
from the chromatographic column can suppress the ionization of the analyte (7).
Indeed, HDL isolated by fast-performance liquid chromatography is heavily contaminated by high molecular weight plasma proteins that coelute
with HDL (168).
BDE-153, however, is not known to coelute
with other analytes in the method applied by Laboratory 2, and BDE-153 concentrations were almost 2-fold higher in December than in September for three family members (Table 1).
Whereas deuterated analogs are readily available from many suppliers, C-13-labeled analogs are more suitable for use as an IS because they coelute
with unlabeled cholesterol.
We quantified the isomers BjF and BbF together because they coelute
and exhibit similar mass spectra.
Exact measurement of D variants of CDT is difficult, however, because di- and trisialylated Tf may coelute
with the tetrasialylated D peak in HPLC or comigrate in CZE.
Combined with Agilent's unique Deconvolution Reporting Software (DRS) and databases, compounds can be detected even when they coelute
, and much of the tedium is removed from complex analyses.
These compounds were not observed in SRM 3085 by GC-ECD and did not coelute
with other PCB congeners present in SRM 3085 on a 5% phenyl methylpolysiloxane capillary GC column.
S-ISCO[TM] (Surfactant-Enhanced In-Situ Chemical Oxidation) is a below ground coelute
oxidant-cosolvent/surfactant mixture designed to destroy subsurface Non-Aqueous Phase Liquids (NAPLs).
Thus, after verifying that FFA peaks did not coelute
with FAME, the procedure of Ichihara et al.