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Silica gel was modified firstly with aminepropyltrimethoxisilane obtaining the matrix named as SILNH 2 . The SILNH 2 silica reacted subsequently with thioglycolic acid Sil-Ntga. The elemental analysis showed the presence of 0.98mmolg −1 of organic moieties immobilized on silica. Infrared and 13 C NMR spectroscopic data in conjunction with thermogravimetric measurements...
The adsorption of DPKSH onto silica gel was investigated, at 25+/-1 o C and pH 1, 4.7 and 12. For the same DPKSH concentration interval, the minimum required time of contact for adsorption maximum at pH 4.7 was smaller than at pH 1 and the maximum amount of DPKSH adsorbed per gram of silica at pH 1 is smaller than at pH 4.7. At pH 12 the DPKSH adsorption onto silica gel was not significant...
Microwave-assisted desorption (MAD) coupled to in situ headspace solid-phase microextraction (HS-SPME) was first proposed as a possible alternative pretreatment of samples in absorbent collected from workplace monitoring. Aniline collected on silica gel was investigated. Under microwave irradiation, the aniline was desorbed from silica gel and directly absorbed onto the SPME fiber in the headspace...
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