A technique for determination of mercury is described; it is based on electrolytic reduction of Hg(II) ion on a graphite cathode, the trapping of mercury vapor and its volatilization into a quartz tube aligned in the optical path of an atomic absorption spectrometer. The electrochemical cell consisted of a graphite cathode and an anode operating with constant direct current for the production o...

A simple spectrophotometric system, based on a prolonged pseudo-liquid drop device as an optical cell and a handheld charge coupled device (CCD) as a detector, was constructed for automatic liquid-liquid extraction and spectrophotometric speciation of trace Cr(VI) and Cr(III) in water samples. A tungsten halogen lamp was used as the light source, and a laboratory-constructed T-tube with two ope...

A flow injection (FI) spectrophotometric determination of europium (III) is described, based on the complexation between europium (III), and chlortetracycline (CTC) in a Tris-buffer pH 8.0 medium. The resulting yellow-coloured complex is measured at its absorption maximum of 400 nm after 100 mul of sample or standard solution containing europium (III) are injected into the merged streams of CTC...

The purpose of this study is to apply the G7 method for calibration on a four-color flexographic press. G7 controls and calibrates a press using colorimetric values rather than tone value increase. Two press runs were completed to calibrate a flexographic press. The first press run provided data for creating a control curve called Neutral Print Density Curve (NPDC) for the press run with a spec...

Abstract The outbreak of the COVID-19 pandemic has adversely affected most important areas modern world. One challenges related to counteracting effects it was necessary develop methods for quantitative determination pharmaceuticals used in treatment patients suffering from this disease and its long-term effects. Budesonide (BUD) is a widely available inexpensive corticosteroid extensively not ...

The use of nuclear backscatter moisture -density gages for soil compaction control has gained a great deal of favor during the past several years . However, before this type of equipment can be applied to routine field control, several factors influencing the operation of the gage must be investigated. Various techniques for expressing nuclear results were studied, and the results indicate that...

BACKGROUND Insulin-like growth factor 1 (IGF-1)(7) is a key mediator of growth hormone (GH) action and a well-characterized biomarker of GH abuse. Current immunoassays for IGF-1 suffer from poor concordance between platforms, which makes comparison of results between laboratories difficult. Although previous work has demonstrated good interlaboratory imprecision of LC-MS/MS methods when plasma ...

In this paper, we introduce a novel – physico-chemical – approach for calibration of a digital camera chip. This approach utilizes results of measurement of incident light spectra of calibration films of different levels of gray for construction of calibration curve (number of incident photons vs. image pixel intensity) for each camera pixel. We show spectral characteristics of such corrected d...

BACKGROUND End-stage kidney disease is associated with poor prognosis. Health care professionals must be prepared to address end-of-life issues and identify those at high risk for dying. A 6-month mortality prediction model for patients on dialysis derived in the United States is used but has not been externally validated. AIM We aimed to assess the external validity and clinical utility in a...

Radiometric calibration is the basis of both hyperspectral data applications and quantitative remote sensing. While at present, there is no good and suitable method for radiometric calibration in the aerospace hyperspectral data. The paper uses the highest spectral resolution Hyperion EO-1 satellite data in current world Spaceflight sensor as information source, using a variety of calibration m...