Type:
Text
Dimension:
---
Value Range:
Blank, Unknown, Standard, Validate, Matrix, Spiked, Unspiked
Related Parameters:
Amount, Baseline Subtraction
Default:
Unknown
Description:
The Type Sample Variable indicates the sample type:
-
Select Unknown for an unknown analysis sample:
. -
Select Standard for a standard sample with known concentration:
. -
Select Validate for a Validation Sample:
. -
Select Blank for a Blank Run Sample:
. If a sample is corrected by Raw Data of a blank run sample, this is referred to as Blank Run Subtraction. -
Select Matrix for a Matrix Blank Sample:
-
Select Spiked for a Spiked Sample:
. -
Select Unspiked for an unspiked unknown sample to be analyzed with the Standard Addition method:
.
Functions:
Blank
The sample injected with the Inject command is no "real" sample; it is a Blank Run. In this case, the baseline is stored for subsequent subtraction from a later sample. Thus, if baseline subtraction is enabled for a subsequent sample, the baseline chromatogram may be subtracted before integration.
Tip:
If an ICS 1000/1500/2000 or ICS-1100/1600/2100 Ion Chromatography System does not have an AS or AS50 installed, injection is performed with the Pump_InjectValve.InjectPosition command. Unlike the autosampler Inject command, the Pump_InjectValve.InjectPosition command always performs an injection, even for a Blank Run Sample.
Unknown
The (unknown) sample is analyzed to determine whether it contains one or more substances.
Standard
The sample is a calibration standard. The corresponding Amount values of the single peaks are listed in the corresponding Amount Table column.
Validate
Validation samples are treated as ordinary analytes. However, the type is written to the result file. The validation sample references the Amount column in the subordinated peak table. The Amount column referenced by such a validation sample contains the required amount or concentration for each peak of the sample. In the report, this amount or concentration can be compared with the calculated actual amount or concentration using the Amount Deviation peak variable.
Matrix
Contrary to Blank Run samples, Matrix Blank Samples are "real" samples that are injected. Chromeleon automatically subtracts the peak areas or peak heights of the matrix blank sample from the corresponding peak areas or peak heights of all samples in the sequence. The resulting areas (heights) are then used for all other calculations, such as calibration. However, the respective peaks must have been identified for both the unknown sample (or standard sample) and the Matrix Blank Sample.
Note:
Thus, matrix blank samples are treated differently from "normal" Blank Run Samples. For normal blank run samples, the chromatogram is subtracted point by point from the chromatogram of the current sample.
Tip:
Matrix blank samples are subtracted only if they are evaluated in the same QNT Method. Otherwise, they are not considered.
Spiked
A known amount is added to an unspiked sample (see Unspiked). The spiked sample is used to analyze the original unspiked sample, using the Standard Addition method.
Unspiked
Known amounts of the analytes to be determined are added to unspiked unknown samples. Afterward, the original (Unspiked) and the Spiked samples are analyzed. The quantitative analysis of the results is performed, using the Standard Addition Calibration Mode, i.e., the Standard Addition method.