Development of a New Sensitive Method for Lead Determination by Platinum-Coated Tungsten-Coil Hydride Generation Atomic Absorption Spectrometry

Abstract

A novel very sensitive and rapid analytical method was improved where gaseous lead formed was transported to and trapped on an externally heated platinum-coated tungsten-coil atom trap for in situ preconcentration. The analytical performance of the developed method with the graphite furnace atomic absorption spectrometry (GFAAS) method was compared. All critical parameters affecting the performance of both methods were optimized. The limit of quantitation (LOQ) was found as 11.0 ng L −1 and the precision was 2.3% in terms of percent relative standard deviation (RSD%). Characteristic concentration (Co) of the developed trap method was indicating a 32.5-fold enhancement in sensitivity compared to the GFAAS method. In order to investigate the surface morphology of the W-coil, scanning electron microscope−energy-dispersive X-ray (SEM-EDS) analyzes were performed. The accuracy of the trap method was tested by certified reference materials: NIST SRM 1640a (the elements in natural water) and DOLT:5 (dogfish liver). Interferences from other hydride-forming elements were investigated. Application of the trap method was demonstrated by the analysis of some drinking water and fish tissue samples. The t test was applied to drinking water samples, and the results indicated that there was no statistically significant error.

Atomic spectrometry update: review of advances in the analysis of clinical and biological materials, foods and beverages

“…Atasoy, 120 aiming to improve the LOD for the determination of Pb in drinking water and fish samples using AAS, developed a procedure based on HGAAS with an externally heated platinum-coated tungsten-coil atom trap for in situ Pb pre-concentration and compared its analytical performances with those of a conventional method, based on Zeeman corrected GFAAS. The instrumental apparatus involved a quartz T-tube atomiser, externally heated with an air–acetylene flame, and connected to a smaller QT where the tungsten coil was placed.…”

“…Approximately 0.1–0.5 g of each fish (common pandora and red mullet) tissue (liver, muscle, and gill) sample underwent MAD with 10 mL 65% HNO 3 in Teflon vessels. The digests were further diluted, presumably with UP water as reported by Atasoy, 120 to achieve the volume of at least 29.6 mL necessary for the in situ atom trapping approach. The method was validated by the analysis of different matrix CRMs (NIST SRM 1640a trace elements in natural water; BCR 146R Sewage Sludge-industrial origin and DOLT5 dogfish liver) that underwent the same sample pre-treatment as the real samples.…”

A prototype of ultrasensitive time-resolved fluoroimmunoassay for the quantitation of lead in plasma using a fluorescence-enhanced europium chelate label for the detection system

“…The methods used to detect lead included graphite furnace atomic absorption spectrometry, 10,11 atomic fluorescence spectrometry, 12,13 and inductively coupled plasma mass spectrometry. 14 These spectrometric methods offer high sensitivity and accuracy; however, they involve tedious and time-consuming sample pretreatment, use expensive and complex equipment, and need highly skilled personnel, making them impractical.…”

Removal of Ni(II), Cu(II), Pb(II), and Cd(II) from Aqueous Phases by Silver Nanoparticles and Magnetic Nanoparticles/Nanocomposites

“…Pb is taken into the body by contact, respiration, and feeding ways, and then it mixes with the blood, binds to the erythrocytes, and has a toxic effect. When exposed to high doses, it causes damage to neurological functions. − According to the International Agency for Research on Cancer (IARC), Pb is in the class of second-class carcinogens. Cu is widely used in water pipes, valves, roof coatings, inorganic paints, pesticides, nutritional additives, fungicides, and algaecides.…”