A new analytical method for the determination of elements in
filtered aqueous matrices using inductively coupled plasma-mass
spectrometry (ICP-MS) has been implemented at the U.S. Geological
Survey National Water Quality Laboratory that uses
collision/reaction cell technology to reduce molecular ion
interferences. The updated method can be used to determine elements
in filtered natural-water and other filtered aqueous matrices,
including whole-water, biota, sediment, and soil digestates. Helium
or hydrogen is used as the collision or reaction gas, respectively,
to eliminate or substantially reduce interferences commonly
resulting from sample-matrix composition. Helium is used for
molecular ion interferences associated with the determination of
As, Co, Cr, Cu, K, Mg, Na, Ni, V, W and Zn, whereas hydrogen is
used for Ca, Fe, Se, and Si. Other elements that are not affected
by molecular ion interference also can be determined simply by not
introducing a collision/reaction gas into the cell. Analysis time
is increased by about a factor of 2 over the previous method
because of the additional data acquisition time in the hydrogen and
helium modes. Method detection limits for As, Ca, Co, Cr, Cu, Fe,
K, Mg, Na, Ni, Se, Si (as SiO2), V, W, and Zn, all of which use a
collision/reaction gas, are 0.06 microgram per liter (?g/L) As,
0.04 milligram per liter (mg/L) Ca, 0.02 ?g/L Co, 0.02 ?g/L Cr,
0.04 ?g/L Cu, 1 ?g/L Fe, 0.007 mg/L K, 0.009 mg/L Mg, 0.09 mg/L Na,
0.05 ?g/L Ni, 0.04 ?g/L Se, 0.03 mg/L SiO2, 0.05 ?g/L V, 0.03 ?g/L
W, and 0.04 ?g/L Zn. Most method detection limits are lower or
relatively unchanged compared to earlier methods except for Co, K,
Mg, Ni, SiO2, and Tl, which are less than a factor of 2 higher.
Percentage bias for samples spiked at about one-third and
two-thirds of the concentration of the highest calibration standard
ranged from -8.1 to 7.9 percent for reagent water, -14 to 21
percent for surface water, and -16 to 16 percent for ground water.
The percen
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