Synthesize of low price stationary phases with permanent groups for reversed-phase liquid chromatography (RP-HPLC) has gained great importance in the past several years. In chromatographic analyses, silica gels are commonly used as a supporting material as they give high mechanical strength and swelling resistance. Additionally, different particle and pore size availability and low cost makes these materials one of the most suitable stationary phase. In this work, chemically bonded C 8 phase was synthesized by sol-gel route and instead of toxic silicone alkoxides, non-toxic water glass was chosen as a precursor. Linking process of C 8 groups to silica gel was carried out by trimethoxy(octyl)silane. The end-capping and C 8 binding procedure was analyzed by Fourier transform infrared (FTIR) spectroscopy and morphology of C 8 particles were characterized by scanning electron microscope (SEM).
In this study, in the soil samples collected from farmland with two different pH environments located in Kırklareli Province, heavy metals (Pb and Ni) were aimed to investigate the relationship. The working pH values are took in 3 different periods (after the formation of the plant, week of 1 and 6, harvest time) from the farm land in the town of Kırklareli and Kavaklı. In order to determine the concentration of Pb and Ni metals, the reading process was performed by the Flame Atomic Absorption Spectrophotometer (FAAS). The concentrations of Pb and Ni metals in soils in the first region were 36.3-43.7 mg/kg and 12.6-14.9 mg/kg, in the second region soil concentrations were 11.7-17.1 mg/kg, 0.09-0.24 mg/kg, 3.12-4.353 mg/kg, 7.89-11.2 mg/kg, 56.3-9.54 mg/kg, respectively. The concentrations of Pb and Ni metals in first region plant components were 1.93-12.1 mg/kg, and 0.56-11.8 mg/kg, the second region was 6.92-14.8 mg/kg and 0.58-9.37 mg/kg, respectively. The relative standard deviation (RSD) was found to be less than 10%. The RSD of analysis of samples have satisfying precision.
For five different regions in Kırklareli province, heavy metals; such as Pb, Ni, Cu, Mn, Cd, Cr, Co, Zn, Mo, and Fe in the mixture of leaves and flowers from linden trees (Tilia tomentosa L.) were analyzed by using flame atomic absorption spectroscopy after the samples were dissolved with microwave method. Also, organochloride pesticides; such as ∑BHC: [α-BHC, β-BHC, γ-BHC, and δ-BHC], ∑DDT: [4,4’-DDD, 4,4’-DDE, and 4,4’-DDT], α-Endosulfan, β-Endosulfan, Endosulfan sulfate, Heptachlor, Heptachlor-endo-epoxide, Aldrin, Dieldrin, Endrin aldehyde, Endrin ketone, Endrin and Methoxychlor in these samples were determined by utilizing gas chromatography mass spectroscopy after the samples were prepared for analyses by using QuEChERS method. The metal concentrations in the samples were in the range of 45.3 to 268 mg/kg for Mn, 0.25 to 18.8 mg/kg for Cu, 11.5 to 46.1 mg/kg for Zn, 128 to 1310 mg/kg for Fe, 10.4 to 38.6 mg/kg for Mo, 0.82 to 1.34 mg/kg for Cd, 0 to 6.45 mg/kg for Ni, 0 to 19.2 mg/kg for Pb, and 0 to 8.25 mg/kg for Cr. Moreover, the concentrations of organochloride pesticides in samples were usually determined to be lower than their maximum residue level values given the pesticide residue limit regulation of Turkish Food Codex.
ÖzTrakya bölgesi için hayati önem arz eden Ergene Nehri'nin kirlilik durumunun artarak devam ettiği bilinen bir gerçektir. Bölgede olmazsa olmaz, ekonomik gelişime katkı sağlayan sanayi yatırımlarının artmasına ve endüstriyel zirai ilaç kullanımına paralel olarak gelişen çevre kirliliği sorunu da takip edilmesi zaruri olgulardandır. Batı Trakya'nın temel tarımsal üretim materyallerinden biri olan çeltik bitkisi de yetiştirildiği koşullar bakımından bu kirlilikten etkilenen başlıca ürünler arasında bulunmaktadır. Doğrudan gıda ürünü olarak tüketime sunulan, insan sağlığını doğrudan etkileyebilecek potansiyelde, tarım ürünlerinin ihtiva ettiği ve toksisiteye neden olabilecek ağır metal birikim düzeyleri üzerine yapılan çalışmalar da önemini korumaya devam etmektedir. Toksik özellikteki ağır metallerin çevresel koşullarda bozunmadan kalabilmeleri ve besin zincirine dahil olarak ekolojik çevrede birikim düzeylerini arttırmaya devam ettiğinden uzun yıllar etkilerini görebileceğimiz kimyasal kirlilikler arasında öncelikli sıralarda yerini almaktadırlar.Yapılmış olan çalışma çerçevesinde Ergene Nehri'nin Edirne ili Uzunköprü ilçesi sınırları içinde bulunan Muhacirkadı Köyü'nden, çeltik tarımı yapılan arazilerden tohum ekimi ve hasat dönemleri gözetilerek toprak, sulama suyu ve bitki örneklemeleri yapılmıştır. Numuneler mikrodalga çözünürleştirme metodu ile analize hazırlanarak, ICP-OES (inductively coupled plasma-optical emission spectrometry) cihazı ile içerdikleri Ni ve Co miktarları analiz edilmiştir. Metodun doğruluğunun kontrolü NIST-2709 (san joaquin toprağı), NIST-1640a (doğal su) ve NIST-1570a (ıspanak yaprağı) sertifikalı referans maddeleri (SRM) ile sağlanmıştır. AbstractThe pollution situation of the Ergene River which is vital for the Thrace region continues to increase. Industrial activities and increasing environmental pollution problems with the use of pesticides must also be followed. One of the main agricultural production materials of Western Thrace is rice paddy, which ID ID ID
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