Origin has a tool for removing rows in a worksheet based on duplications in one column.
To open this dialog box:
Controls recalculation of analysis results
For more information, see: Recalculating Analysis Results
The column which contains the duplicated data.
Specify how to reduce worksheet with duplicated rows.
Specify whether to be case sensitive in comparing two strings.
Specify output worksheet.
For help with the range controls, see: Output Results
Count and output the number of duplicate rows.