Unsere Gruppe organisiert über 3000 globale Konferenzreihen Jährliche Veranstaltungen in den USA, Europa und anderen Ländern. Asien mit Unterstützung von 1000 weiteren wissenschaftlichen Gesellschaften und veröffentlicht über 700 Open Access Zeitschriften, die über 50.000 bedeutende Persönlichkeiten und renommierte Wissenschaftler als Redaktionsmitglieder enthalten.
Open-Access-Zeitschriften gewinnen mehr Leser und Zitierungen
700 Zeitschriften und 15.000.000 Leser Jede Zeitschrift erhält mehr als 25.000 Leser
Yanbei Zhu, Yuko Kitamaki, Megumi Kato, Tomoya Kinumi, Akiharu Hioki and Koichi Chiba
A method for determination of sulfur was investigated using an inductively coupled plasma tandem quadrupole mass spectrometer (ICP-QMS/QMS) with an octopole reaction/collision cell (ORC). It helped to achieve a lower background equivalent concentration (BEC) and a lower detection limit (DL) when 10% HNO3 with 10% ethanol was applied as the rinse solution. Sulfur measurement was carried out by shifting the measured mass from 32S+ to 32S16O+ by reaction with O2 gas. The introduction of H2 together with O2 as reaction gases provided a lower DL. The BEC and DL of 32S were 0.83 ng g-1 and 0.03 ng g-1, respectively. The validation of the present method was confirmed by determining sulfur in certified reference materials, NIST SRMs 2773, 2298, and 2299. The results of sulfur in amino-acids and protein indicate that determination of sulfur could be an effective technique for quantification of sulfur-containing amino acids and proteins.