The solvent was removed in vacuum and the residue was extracted with diethylether
stimulated hydrolytic rate of long chain PC ([C.sub.12] to [C.sub.18]) but inhibited the shorter chain PC ([C.sub.8] to [C.sub.10]).
is one of the low boiling point solvents, that is, employed chemical desorbent in many studies [14, 26-28].
The yellowish oil (0.3 ml/ for leaves and 0.5 ml for flower and fruits) was dissolved in diethylether
(lml) and collected and dehydrated by anhydrous sodium sulfate.
The analysis procedures were carried out as follows: five grams of the deposit under investigation were accurately weighed and the solid material was extracted from the sample by diluting it several times in petroleum ether and diethylether
. The residual solid material was then collected by evaporating the solvents, and the non-organic material was weighed.
Prediction of [B.sub.i] for slightly polar compounds with two methods Compounds [beta] Mod Pitzer Tsonopoulos AAD AAD C[Cl.sub.4] 0.25 75.7 99.2 CH[Cl.sup.*.sub.3] 0.25 9.9 28.0 [CH.sub.3]Br 0.25 29.8 57.2 1,2 Dichloroethane * 0.25 10.1 8.8 1,1 Difluoroethane * 0.25 9.9 14.0 Fluoro-benzene * 0.25 15.6 16.3 Hexafluorobenzene 0.55 20.6 108.0 Perfluoro-2-methylpentane 0.55 61.4 73.0 Dichlorofluoromethane 0.25 111.2 93.6 Perfluoropropane 0.55 68.7 15.0 Methylethylsulphide 0.25 97.0 91.2 Diethylsulphide 0.25 97.0 58.8 Ethylmercaptane 0.25 40.9 26.6 Dimethylether 0.25 32.3 43.8 Diethylether
0.25 87.6 77.1 Mean 50.9 57.6 * Compounds whose experimental data were used to derive the relation reported in Table 1 for this class of molecules Table 3.
Several extraction solvents were attempted: diethylether
, ethylacetate, chloroform, n-hexane, n-pentane, and dichloromethane.
Samples (2 mL) were extracted with 2 mL diethylether
during 30 min.
The reaction was terminated with 2 mL of saturated NaCl and the benzoylpolyamines extracted in 2 mL of diethylether
(anhydrous, HPLC grade).
Now soxhlet extracts (1mL) of each sample were poured on to the column and column was eluted first with 10 ml n-Hexane for PCBs and then with 10 mL 15% diethylether
in n-Hexane for pesticides.
Thus obtained products were filtered and washed 4 times with water and diethylether
. The desired products were obtained with high purity.
The samples were extracted with diethylether
(WAKO, Osaka, Japan).