Michael T. Ringel

This is the proposed solution for issue #49.

TL;DR First of all, thank you for the great project! IMHO, the regexp in the total_activity function should be revised to match the correct species. A possible solution is given...

To be able to use this project in [pyodide](https://pyodide.org/en/stable/), we needed to add the [emscripten](https://emscripten.org/) environment. The [VIPhreeqc ](https://github.com/Vitens/VIPhreeqc)-library has sucessfully been built with pyodide 0.28.0 but is not included...

TLDR; Thank you for the great project! The IPhreeqc library was upgraded to version 3.8.7 based on the code hosted at the [iphreeqc github repo](https://github.com/usgs-coupled/iphreeqc). Building has been tested on...