Determination of acid-soluble and acid-insoluble tin in tough-pitch copper using wet chemical techniques

1969 ◽  
Vol 41 (11) ◽  
pp. 1489-1491 ◽  
Author(s):  
C. H. McMaster
Keyword(s):  
Wet Chemical ◽  
Chemical Techniques

scholarly journals Sensitive Aptamer SERS and RRS Assays for Trace Oxytetracycline Based on the Catalytic Amplification of CuNCs

Nanomaterials ◽  
2021 ◽  
Vol 11 (10) ◽  
pp. 2501
Author(s):  
Shuxin Chen ◽  
Xiaowen Lv ◽  
Jifan Shen ◽  
Siqi Pan ◽  
Zhiliang Jiang ◽  
...  
Keyword(s):  
Catalytic Activity ◽  
Rayleigh Scattering ◽  
Molecular Probes ◽  
Resonance Rayleigh Scattering ◽  
Surface Enhanced ◽  
Surface Enhanced Raman ◽  
Enhanced Raman Scattering ◽  
Wet Chemical ◽  
Amplification Reaction

A new method for the determination of oxytetracycline (OTC) has been established by coupling the catalytic amplification reaction of copper nanoclusters (CuNCs) with the aptamer reaction. CuNCs prepared by a wet chemical method have the catalytic activity for the formation of gold nanoparticles (AuNPs) resulting from a HAuCl4-ethanol (En) reaction. The experimental results showed that OTC aptamer (Apt) can be adsorbed on the surface of CuNCs in a non-specific way, thus inhibiting its catalytic activity. When OTC was added to the solution, the OTC-Apt complex was generated by a specific reaction, which made the CuNCs desorb and restore their catalytic activity. With the increase of OTC, the recovery of the catalytic activity of CuNCs is strengthened, the reaction speed is accelerated, and the number of AuNPs is increased. The generated AuNPs exhibited surface enhanced Raman scattering (SERS) signals at 1615 cm−1 in the presence of Vitoria blue 4R (VB4R) molecular probes, and a resonance Rayleigh scattering (RRS) peak at 586 nm. There is a good linear relationship between the intensities of SERS, or RRS, and OTC concentration at the range of 37.5–300 ng/L or 37.5–225 ng/L, respectively. A new SERS and RRS assay for the determination of trace OTC based on the regulation of CuNCs catalysis was established.

Determination of Arsenic and Selenium in Whole Fish by Continuous-Flow Hydride Generation Atomic Absorption Spectrophotometry

1989 ◽  
Vol 72 (3) ◽  
pp. 484-486
Author(s):  
William G Brumbaugh ◽  
Michael J Walther
Keyword(s):  
Atomic Absorption ◽  
Continuous Flow ◽  
Hydride Generation ◽  
Atomic Absorption Spectrophotometry ◽  
Atomic Absorption Determination ◽  
Absorption Determination ◽  
Relative Standard ◽  
Wet Chemical ◽  
High Concentrations

Abstract A combined wet chemical and dry ash digestion and use of a continuous- flow hydride generator coupled with a flame-heated quartz cell enabled the simple, precise, and highly automated atomic absorption determination of arsenic and selenium in tissues of whole fish. Percent relative standard deviation averaged 4% for each element; method detection limits (μg/g dry wt) were about 0.06 for arsenic and 0.04 for selenium. Digestion of samples proceeded with little operator attention and without perchloric acid. Analysis for arsenic as As(V) simplified sample preparation but care had to be exercised to avoid interferences from high concentrations of selenium.

scholarly journals An in situ SAXS investigation of the formation of silver nanoparticles and bimetallic silver–gold nanoparticles in controlled wet-chemical reduction synthesis

2020 ◽  
Vol 2 (1) ◽  
pp. 225-238 ◽  
Author(s):  
Paulo R. A. F. Garcia ◽  
Oleg Prymak ◽  
Viktoria Grasmik ◽  
Kevin Pappert ◽  
Wagner Wlysses ◽  
...  
Keyword(s):  
Silver Nanoparticles ◽  
Online Monitoring ◽  
Chemical Reduction ◽  
Structural Parameters ◽  
Nanoparticle Synthesis ◽  
Small Particles ◽  
Metallic Nanoparticle ◽  
Wet Chemical

In situ investigation of metallic nanoparticle synthesis with an online monitoring of the system by SAXS. Determination of structural parameters and growth processes. Ag-NP synthesis presented a bimodal system with the presence of small particles (∼3 nm).

Controlled Stepwise Growth of Siloxane Chains Using Bivalent Building Units With Different Functionalities

2010 ◽  
Vol 1272 ◽  
Author(s):  
Nils Salingue ◽  
Dominic Lingenfelser ◽  
Pavel Prunici ◽  
Hess Peter
Keyword(s):  
Photoelectron Spectroscopy ◽  
Attenuated Total Reflection ◽  
Silicon Surfaces ◽  
Chain Growth ◽  
One Dimensional ◽  
X Ray ◽  
Sioh Group ◽  
Wet Chemical ◽  
Chemical Condensation

AbstractOrganic/inorganic hybrids of silicon and their subsequent chemical modification are of interest for tailoring and structuring surfaces on the nanoscale. The formation of monolayers on hydroxylated silicon surfaces was employed to synthesize molecular dimethylsiloxane chains by wet-chemical condensation reactions, using dimethylmonochlorosilane as the precursor. The SiH group of the resulting dimethylsilyl termination could be selectively oxidized to the SiOH group, which opened the possibility of bonding another species. By repeating the condensation and oxidation cycle the stepwise growth of one-dimensional dimethylsiloxane chains was achieved. The ongoing chain growth was characterized by attenuated total reflection (ATR) Fourier transform infrared (FTIR) spectroscopy, x-ray photoelectron spectroscopy (XPS), spectroscopic ellipsometry (SE), and determination of the surface energy by contact-angle experiments.

The Determination of Iron in Used Lubricating Oil

1971 ◽  
Vol 25 (6) ◽  
pp. 668-671 ◽  
Author(s):  
Gerald S. Golden
Keyword(s):  
Internal Standard ◽  
Rotating Disk ◽  
Lubricating Oil ◽  
X Ray ◽  
Chemical Technique ◽  
Used Lubricating Oil ◽  
Wet Chemical ◽  
Wet Chemical Technique ◽  
Instrumental Methods

Iron analyses performed on used gas turbine lubricating oil samples by several variations of rotating disk–spark emission spectrography, atomic absorptiometry, and x-ray fluorescence spectrometry are compared with a quantitative wet chemical technique. The results indicate that emission spectrography with a cobalt internal standard, atomic absorptiometry with a nitrous oxide–acetylene flame, and x-ray fluorescence, both dispersive and nondispersive, are the most reliable instrumental methods. The iron contained in the samples exists primarily as particulates 1 µ or less in diameter.

Spectrographic Determination of Boron in Clay Shales

1968 ◽  
Vol 22 (4) ◽  
pp. 272-274 ◽  
Author(s):  
R. D. Cody
Keyword(s):  
Internal Standard ◽  
Chemical Analyses ◽  
Spectrographic Determination ◽  
Clay Shales ◽  
Average Coefficient ◽  
Wet Chemical ◽  
Acceptable Agreement

Cobalt has been found to be an acceptable internal standard for the spectrographic determination of boron in shale. Its use leads to acceptable agreement between spectrochemical and wet-chemical analyses, and has given an average coefficient of varation of ±3.57% for 57 clay samples.

Determination of Stoichiometry in Lanthanum Strontium Manganates(III)(IV) by Wet Chemical Methods

1994 ◽  
Vol 113 (2) ◽  
pp. 320-326 ◽  
Author(s):  
I.G.Krogh Andersen ◽  
E.Krogh Andersen ◽  
P. Norby ◽  
E. Skou
Keyword(s):  
Chemical Methods ◽  
Lanthanum Strontium ◽  
Wet Chemical
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