Trichlorfon deposition

Other studies were conducted by the FS in 1976 to expand the data base on the size of drops which deposited on Douglas-fir needles. These studies provided an opportunity to determine if the drop size distribution would be similar to drop size distributions of tank mixes studied earlier. The 1976 study involved aerial application of acephate and trichlorfon, and the 1981 study involved Bacillus thuringiensis (Dipel 4L and Thuricide 16B). These data have not been published or reported previously. The chemical tank mixes were applied by helicopter and the B.t. tank mixes were applied by fixed-wing aircraft. 

Shi, H., Zhao, Z., Song, Z., Huang, J., Yang, Y., Anzai, J., Osa, T., Chen, Q. (2005). Fabrication of acetylcholine biosensor by a layer-by-layer deposition technique for determining trichlorfon. Electroanalysis 17 1285-90. 

Other than AUNPs, Quantum dots have also been employed in the development of pesticide sensors. Li et al. have synthesized Poly (N-vinyl-2-pyrrolione) (PVP)-capped CdS quantum dots (QCdS-PVP) from CdC and Na2S in the presence of PVP [37], AChE was immobilized onto this QCdS-PVP matrix incorporated GCE surface. The resulting GCE/ QCdS-PVP/AChE sensor was used for the detection of OP pesticides, such as trichlorfon. The enzyme immobilization procedure was described as follows. About 3 ml of QCdS-PVP was deposited on the surface of the GCE and dried in air. Then 3 ml of 0.5 mg ml"1 AChE along with 2.5% GA was deposited on the surface of the QCdS-PVP modified GCE and dried for 1 h at room temperature. TEM results show that, the QCdS-PVP particles were homogeneously distributed and they possess an average size of 2-4 nm (Fig. 9). 

According to this protocol, we have determined trichlorfon (Figure 62.4) in water samples using AChE-ChOx biosensors, which were constructed by a layer-by-layer deposition of fhe enz3unes on fhe surface of a platinum disk electrode (Shi et al., 2005). The response of the sensor to trichlorfon was evaluafed by a successive addition of frichlorfon info fhe solution of 2 mM of ACh. The oufpuf currenf of fhe sensor decreased as the concentration of frichlorfon increased over fhe concentration range of 1 x 10 to 2 x 10 g/mL. The lower detection limit of fhe sensor was foxmd to be about... 

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