Chemometrics is a scientific discipline closely connected with statistics and mathematics. It has an important role in analytical chemistry. Modern analytical methods provide opportunity to collect large amounts of data for various samples. For handling analytical results different chemometric methods are employed, such as basic statistical methods for the determination of mean and median value...

This review describes the different steps involved in the determination of arsenic in air, considering the particulate matter (PM) and the gaseous phase. The review focuses on sampling, sample preparation and instrumental analytical techniques for both total arsenic determination and speciation analysis. The origin, concentration and legislation concerning arsenic in ambient air are also consid...

In the present study, four simple, rapid, and sensitive charge-transfer spectrophotometric methods were developed for the determination of esmolol hydrochloride (ESM). 2,3-Dichloro-5, 6-dicyano-1, 4-benzoquinone, 1-chloro 2,4-dinitro benzene, 2,5-dichloro-3,6-dihydroxycyclohexa-2,5-diene-1,4-dione (chloranilic acid), and sodium 3,4-dioxo-3,4-dihydronaphthalene-1-sulfonate (Folin’s reagent) were...

Abstract Current methods for determining whether a time series exhibits fractal structure (FS) rely on subjective assessments on estimators of the Hurst exponent (H). Here, I introduce the Bayesian Assessment of Scaling, an analytical framework for drawing objective and accurate inferences on the FS of time series. The technique exploits the scaling property of the diffusion associated to a tim...

Residual solvents (RS) are not desirable substances in the final pharmaceutical product and their acceptable limits have been published in pharmacopoeias and ICH guidelines. The intension of this paper was to review and discuss some of the current analytical procedures including gas chromatographic (GC) and other alternative techniques which are used for residual solvents determination. GC meth...

The crystallinity of cellulose is one of the main structural parameters determining properties like accessibility and reactivity of cellulose. Native cellulose (e.g., wood, pulp, cotton, kenaf, bacteria cellulose) consists of the cellulose I, regenerated cellulose consists of the cellulose II modification. WAXS (wide angle X-ray scattering) is the standard method for the determination of crysta...

Determination and Validation of an Analytical Method for Spiropidion Its Metabolite Spiropidion-enol (SYN547305) in Agricultural Products with LC-MS/MS-Agricultural product,Analytical method,Insecticide,LC-MS/MS,Spiropidion

The well-known Clos network has been extensively used for telephone switching, multiprocessor interconnection and data communications. Much work has been done to develop analytical models for understanding the routing blocking probability of the Clos network. However, none of the analytical models for estimating the blocking probability of this type of network have taken into account the very r...

This paper presents a general analysis for the performance of WLAN location determination systems. WLAN locations determination systems estimates the user location using software-based techniques in a WLAN environment. We present an analytical method for calculating the average distance error and probability of error of WLAN location determination systems. These expressions are obtained with no...

Solid phase microextraction (SPME) has been optimized and applied to the determination of the volatile halogenated compounds (VHCs) and semi-volatile halogenated compounds (SVHCs). Three types of SPME fiber coated with different stationary phases (PDMS-100 mum, CAR/PDMS-75 mum, PDMS/DVB-65 mum) were used to examine their extraction efficiencies for the compounds tested. Experimental parameters ...