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5.3 The “Standards” Window
When GLITTER is operating in element-concentrations mode, the “Standards”
window is an important step in data reduction. However, in isotopic-ratio mode it
purpose is more to give information and detailed user-input is often not required.
Thus, most elements of the window (excluding the dwelltime text box and the
buttons) only apply to element-concentrations mode. A paragraph is added at the end
of this section to described the function of the “Standards” window when in
isotope-ratio mode. Note that the “Standards” window is modal, which means that
the rest of GLITTER cannot be operated while the “Standards” window is open.
The window is called at any time during a session by selecting WINDOW →
“Standards”. The elements of the “Standards” window are:
The Reference Materials Droplist
The “Reference Materials” droplist (at the top of the window) relays the name of the
reference material used during the run (e.g. NIST610 or NIST612). This is mostly
detected automatically by GLITTER if the analyses of the reference materials are
labeled correctly, but they can also be set/changed during a session by making a
selection from this droplist.
The Internal Standards Droplists (element-concentrations mode only)
The “Internal Standards” droplist (second from the top), allows the use of anywhere
from one to three isotopes as internal standard(s). Depending on the choice made in
this droplist, one to three minor droplists appear, requesting the identity of these
internal standards. In more detail, the choices are:
(a) One isotope as internal standard (recommended). This is the default choice and a
single minor droplist appears where the isotope to be used as internal standard is
selected.
(b) One isotope for standards, another for samples. Two isotopes (of the same
element, e.g. Mg24 and Mg25) are used as internal standard. When this option is
selected, two minor droplists appear where these isotopes are selected. Be aware that
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