【单选题】The purpose of the ashing step in graphite-furnace atomic-absorption spec-troscopy is to()
A.
Vaporize metal atoms to be analyzed
B.
Cause the metal species to form carbides which are more volatile
C.
Convert the graphite furnace to ash to avoid carbide formation
D.
Burn off organic species that would interfere with the elemental analysis
【判断题】The main analytical techniques used for determination of trace elements in environmental samples include: Atomic absorption spectrometry (flame or electrothermal) (AAS, ET-AAS), atomic fluorescence sp...
【单选题】In ______, Erwin Müller, working at Siemens Research Laboratory, invented the field emission microscope, allowing near-atomic-resolution images of materials.
【判断题】元曲《赵氏孤儿》中屠岸贾最后没有被赵氏孤儿仇杀。
【判断题】The main analytical techniques used for determination of trace elements in environmental samples include: Atomic absorption spectrometry (flame or electrothermal) (AAS, ET-AAS), atomic fluorescence sp...
【简答题】Serum containing Na + gave a signal of 4.27 mv in an atomic emission ysis. 5.00 mL of 2.08 M NaCl were added to 95.0 mL of serum. The spiked serum gave a signal of 7.98 mV. How much Na + was in th...