In a separate experiment, a crystalline sample of 3 was also obtained starting from an isolated sample (20 mg) of 2 dissolved in pyridine (1.0 mL) in an NMR tube. The resulting red-brown solution was heated at 60 °C for 3 h and then layered by toluene (1.0 mL) to ...
Lead has been determined in medicinal plants using aqueous standards for calibration and a mixture of Pd(NO3)2 and Mg (NO3)2 as chemical modifiers (Rêgo et al., 2012). Lead has been determined in flour samples using only palladium nitrate (Tinas et al., 2018), and in rice grains, ...
Histograms of the fitted coefficients for the data acquired across a relatively large (6.9 µm2) projected surface showed that the sample was quite homogeneous (Supplementary Fig.12). In addition, correlations between emission peak centre wavelength with its width and intensity were observed (2D...
9.2.20A AOACOfficialMethod997.15 LeadinSugarsandSyrups GraphiteFurnaceAtomicAbsorptionMethod FirstAction1997 A.Principle TestportionsarewetashedwithHNO 3 –H 2 O 2 andanalyzedusing graphitefurnaceatomicabsorptionspectrophotometry(GFAAS). Magnesiumnitrateisusedasamatrixmodifier,withairashing,plat- formatomization,...
Inhalation of lead oxide nanoparticles (PbO NPs), which are emitted to the environment by high-temperature technological processes, heavily impairs target organs. These nanoparticles pass through the lung barrier and are distributed via the blood into se
A glass test tube containing 1530 mg of ODA was heated in the silicon oil bath until the ODA was completely melted. Subsequently, 117 mg of lead-ethyl xanthate was introduced to the glass tube while the system was kept under continuous stirring and nitrogen purging. After 5 min, the ...
Then, 0.25 g of each of the six kinds of ATP were dispersed in 25 mL of deionized water to form a clay suspension under intense stirring. Then, 0.5 g of PVA was added to the suspension and heated in a water bath at 95 °C. After the complete dissolution of PVA, 0.5 g of SA ...
The colorimetric measurement of Pb using paper-based devices has already been established, in which the method is based on the reduction of silver nitrate (AgNO3) using sodium borohydride (NaBH4) as a reducing agent and polyvinyl alcohol (PVA) as a capping agent. In the presence of Pb, the...
The Teflon vessels were heated at 170 °C for 48 h. This produced a white material that was washed with ultrapure water 3 times and alcohol once and recovered using a centrifuge (3500 rpm, 30 min). The final solid was dried at 60 °C for two days. A mass of 3 g of the dried ...
First, the distilled water and glacial acetic acid were heated to 80 °C; then, sodium acetate trihydrate, bismuth nitrate, and barium acetate were added and fully dissolved. After natural cooling to room temperature, acetylacetone was added and stirred for 20 min. Finally, tetrabutyl titanate ...