Laser ablation-inductively coupled plasma-mass spectrometry (LA-ICP-MS) is widely used for spatially resolved measurements of the elemental and isotopic composition of solid materials. One of the problems of trace element analyses by LA-ICP-MS is the existence of interferences that cannot be resolved instrumentally. The software G.O.Joe was developed to calculate trace element concentrations in solid samples obtained by LA-ICP-MS analysis, offering several types of interference corrections. The software´s algorithms are written in the Dart programming language within the Flutter programming framework and follow the procedure described in Jochum et al. (2006 and 2007). G.O.Joe operates online, allowing for immediate data evaluation. It efficiently processes large datasets, offering the flexibility to change parameters at any stage of the workflow. The software also includes features for uploading and storing multiple recovery files (.gojoe), thereby preserving the information from previously evaluated datasets.
A series of three self-instructive interfaces guide the user through a straightforward process of data evaluation. Clear visualization of raw data aids the evaluation of each measurement, facilitating the selection of background and sample signals. Concurrently, inclusions or mixed analyses can be excluded. The input of instrument settings and information about the reference material follows the data processing and is used to convert the isotope count rates to element concentrations. Importantly, advanced calculations can be applied to correct the measurements for isobaric or molecular interferences and abundance sensitivity. These essential advantages of G.O.Joe are demonstrated in different case studies that focus on the mineral chemistry of tungstates (i.e., scheelite) and silicates (e.g., garnet) including the relevant correction methods.
The exported result file (.xlsx) includes the calculated element concentrations, relevant statistical parameters, input data, and instrument settings, ensuring a transparent data processing. While G.O.Joe serves as a time-efficient, transparent, and easy-to-use tool for trace element analysis for experienced LA-ICP-MS users, it is also particularly appealing to newcomers to LA-ICP-MS data analysis. Notably, it is planned as non-commercial software and does not require installation. A first version of G.O.Joe is currently in the final stages of development and will be made available with further information at https://www.gojoe.software.