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This study evaluates the biosorption ability of chitin derived from a specific spider species, namely Drassodes lapidosus (Walckenaer, 1802), that belongs to the family Gnaphosidae. The obtained chitin was characterized using Fourier transform infrared spectroscopy (FT-IR), thermogravimetric analysis (TGA), X-ray diffraction (XRD), and scanning electron microscopy (SEM) analysis. In the alpha form of the obtained chitin, its thermal stability was observed to be 356.9℃ and, the CrI value was 69.16%. In addition, this chitin was used as a bioadsorbent to remove heavy metal ions such as Ni (II), Cu (II), and Pb (II) from the aqueous medium by solid phase extraction (SPE) method using mini adsorption columns. The SPE method was optimized by changing one variable at a time. Main parameters affecting the SPE technique such as solution pH, sample volume, and interfering ions were optimized in model metal solutions containing Pb (II), Cu (II), and Ni (II) at certain concentrations. Metal concentrations were determined using a flame atomic absorption spectrophotometer (FAAS). The results revealed that Pb (II), Cu (II), and Ni (II) ions could be quantitatively removed from their environment at pH 5 through adsorption onto the surface of the chitin, even in the presence of possible interfering anions and cations at high concentrations. Pb (II), Cu (II), and Ni (II) could be separated quantitatively from aqueous solutions by using Drassodes lapidosus chitin as an adsorbent. [ABSTRACT FROM AUTHOR]

The characteristic features of Oecobius rhodiensis Kritscher, 1966 and Oecobius teliger O.P.-Cambridge, 1872, which are recorded for the first time in Turkey, are presented in this paper. Identification keys for the Turkish species, digital and SEM photographs, and drawings of genitalia of the new recorded species are also given together with their zoogeographical distributions. [ABSTRACT FROM AUTHOR]

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