Atrazine recovery

Atrazine Recovery Atrazine Recovery Atrazine Recovery Aqueous Ch loro form... 

Immunosorbents have also found applicability in on-line SPE analysis. An antibody is immobilized on to a silica support and used as an affinity ligand to retain targeted analytes. Components not recognized by the antibody are not retained and some degree of selectivity is attained. Recoveries of 87-103% were obtained for atrazine, simazine, DEA, propazine, and terbuthylazine at the 0.2 xgL concentration level when using immunosorbent SPE (80 mg silica and 2 mg anti-atrazine and anti-chlortoluron antibodies) on-line with LC/APcI-MS however, this method is not applicable to DIA (0% recovery). This compound may be better retained when using an... 

Supercritical fluid extraction (SFE) is generally used for the extraction of selected analytes from solid sample matrices, but applications have been reported for aqueous samples. In one study, recoveries of 87-100% were obtained for simazine, propazine, and trietazine at the 0.05 ug mL concentration level using methanol-modified CO2 (10%, v/v) to extract the analytes, previously preconcentrated on a C-18 Empore extraction disk. The analysis was performed using LC/UV detection. Freeze-dried water samples were subjected to SFE for atrazine and simazine, and the optimum recoveries were obtained using the mildest conditions studied (50 °C, 20 MPa, and 30 mL of CO2). In some cases when using LEE and LC analysis, co-extracted humic substances created interference for the more polar metabolites when compared with SFE for the preparation of the same water sample. ... 

In another study, catfish samples were homogenized in ethyl acetate, and the residues were partitioned into acetonitrile and petroleum ether, subjected to C-18 SPE purification, and analyzed using LC/UV detection. "" Quantitative recoveries were obtained for atrazine, simazine, and propazine in the 12.5-100 lagkg concentration range. 

Beef kidney samples were analyzed for atrazine by dispersing 0.5-g portions of kidney with 2-g portions of XAD-7 HP resin for matrix solid-phase dispersion. " By using a mortar and pestle, a powder-like mixture was prepared that was subjected to subcritical extraction using ethanol-modified water at 100 °C and 50 atm. The ethanol-water extract was sampled using a CW-DVB SPME fiber for direct analysis using ion-trap GC/MS, and the recoveries were quantitative for atrazine at the 0.2 mg kg fortification level. 

Urine was analyzed for atrazine, DEA, DIA, and DACT at the O.I-IOO agkg concentration range but detailed recovery information was not provided. A 5-mE urine sample was mixed in a tube for 15 min with 5mE of diethyl ether and 0.7 g of sodium chloride. After separation of the layers, the aqueous fraction was mixed with 5 mL of ethyl acetate for a second partitioning step. The two organic fractions... 

The effects of water temperature and pesticide concentration on pesticide recoveries were tested by Moye et al The pesticides included alachlor, atrazine, bromacil, chlorothalonil, chloropyrifos, diazinon, endosulfan, simazine and trifluralin. Temperatures of 5,25,45 and 65 °C were tested and concentrations of 0.1,1.0 and 10 pgL were used. Water temperature had a pronounced effect on the recoveries whereas the concentration did not seem to have as great an effect. 

Figure 4.6 Example of the recovery of Ti02- advantage of the magnetic nature of the CoFe204 nanocomposite from an aqueous material. Reprinted from [102] (2010) with suspension after its use as a photocatalyst in the permission from Elsevier, degradation of atrazine. The separation takes...

Photosynthesis inhibition and residues of about 9.0 mg/kg dry weight recovery rapid in atrazine-free medium but some photosynthetic depression for up to 77 h (Jones etal. 1986)... 

Photosynthesis inhibition water levels of 87 pg atrazine/L at 4 weeks recovery in 2-3 weeks in atrazine-free medium (Kemp etal. 1985)... 

Jones, T.W., W.M. Kemp, P.S. Estes, and J.C. Stevenson. 1986. Atrazine uptake, photosynthetic inhibition, and short-term recovery for the submersed vascular plant, Potamogeton perfoliatus L. Arch. Environ. Contam. Toxicol. 15 277-283. 

The LLE of relatively polar and water-soluble organic compounds is, in general, difficult. The recovery obtained from 11 of water with dichloromethane is 90% for Atrazine but lower for its more polar, degradation products, i.e., di-isopropyl- (16%), di-ethyl- (46%),andhydroxy-atrazine (46%). By carrying out LLE with a mixture of dichloromethane and ethyl acetate with 0.2 mol/1 ammonium formate, the extraction recoveries for the three degradation products were increased to 62 %, 87 %, and 65 %, respectively [437]. 

For atrazine, 10 mL of the commercial formulation (5000 ppm) was extracted 3 times (3x15 mL) with ethylacetate (EtAc). The EtAc was dried with Na2S0, filtered, reduced in volume under N2> and adjusted to 10 mL for glc analysis. A sample spiked with 0.1 Ci (U ring- c) atrazine yielded an extraction recovery of 99.6% via scintillation counting. A similar extraction procedure was used for 2,4-D, with a recovery of 76.0%. 

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