Quantum Dots for Pharmaceutical and Biomedical Analysis

Quantum dots (QDs) are luminescent semiconductor nanocrystals that have extraordinary luminescence emission properties. Their semiconductor properties are different from bulk material because of the quantum confinement effects. These properties allow the use of QDs as a luminescent probe for pharmaceutical and biomedical analysis. Herein, we want to mention the synthesis, surface modification, characterization, and application of QDs. The aim of this chapter is to compile and discuss the advantages and disadvantages of QDs and their usage areas

Oxidation state related evaluation of tellurium determination by flame AAS

In this study, when Te (IV) and Te (VI) solutions were prepared by deionized water, unexpected differences in the flame AAS sensitivity for Te were found, depending on the oxidation state. Te (IV) gave a significantly greater absorbance than the same concentration of Te (VI) in the air-acetylene flame. However, when these solutions were prepared in 1.0 % (v/v) HNO(3), they had equal sensitivity for flame AAS. This behavior allows one to determine total Te without any error

Assessment of abnormal DNA repair responses and genotoxic effects in lead exposed workers

Background One of the main sources of occupational exposure to lead (Pb) in Turkey is in workers of battery industries. Genotoxic studies in human populations exposed to this metal have had conflicting results

Atom tuzaklı atomik absorpsiyon spektrometrisi ile duyarlı ve ekonomik eser analiz yöntemlerinin geliştirilmesi

Küçük miktarlarda organik çözücünün aleve verilmesiyle atom tuzağı yüzeyinden atomlaştırmanın gerçekleştirildiği yeni bir analitik yöntem , Atomik Absorpsiyon Spektrometrisi için geliştirilmiştir. Yöntem, Bi, Au ve Mn için uygulanmıştır. 2 dakikalık toplama süreleri için duyarlılık artışları, Bi, Au ve Mn için sırasıyla 94, 180 ve 6.6 olarak bulunmuştur. Atom tuzağı olarak kullanılan kuvrs boru yüzeyindeki türler, SEM ve XPS kullanarak incelenmiştir. Atomlaşma mekanizmasında ısıl etki dışında etmenler de olduğu gösterilmiştir. Önerilen yöntem, alev türlerini değiştirerek seçici analiz yapabilme olanağını sağlayacak niteliklere sahiptir

Determination of cadmium in high salt content matrices by flow injection cold vapor atomic absorption spectrometry

Flow injection cold vapor atomic absorption spectrometry (FI-CVAAS) was used for determination of cadmium in high salt matrices such as dialysis concentrates and textile leach solutions. The parameters such as acidity, concentration of reducing agent, reaction coil length, and carrier gas flow rate were investigated to obtain the best sensitivity. No significant background signal was observed even at high salt concentrations. Under the optimized conditions the limit of detection value (3s(b) m(-1), where s(b) is the standard deviation of the blank signals and m is the slope of the calibration graph) was found to be 0.05 ng mL(-1) for an injection volume of 250 mu L and the precision in terms of relative standard deviation was 3.2% using 11 consecutive measurements of 0.5 ng mL(-1) standard. The standard addition method was used for quantitation. The accuracy of the method was tested using ETAAS as a comparison method and a certified reference material (Waste Water EU-L-1). In both cases, the results were in good agreement at 95% confidence level. The concentrations of cadmium in textile product leach solutions were found to be below the limit value assigned by Oeko-Tex standards