Quantification of 35 pharmaceuticals in surface water by direct injection according to DIN 38407-47 [LCMS-8060]

Importance of the Topic

Pharmaceutical contamination is emerging as a critical issue for aquatic ecosystems and public health. Low concentrations of drugs in surface waters require sensitive analytical methods. Regulatory bodies use health orientation values to guide monitoring and risk assessment.

Goals and Overview of the Study

The objective was to develop a direct injection method using LC MS MS following DIN 38407 47 to quantify 35 pharmaceuticals in surface water. The approach emphasizes routine applicability by combining sensitivity with robustness.

Methodology and Instrumentation

Surface water samples were centrifuged and injected directly with early eluents diverted to waste. Analysis was performed on a Shimadzu LCMS 8060 detector coupled to a Nexera X3 UHPLC system. A Shim pack GIST HP C18 AQ column (150 x 2.1 mm, 3 um) was used at 40 °C with a gradient of water and acetonitrile buffers at 0.4 mL min. Mass detection in MRM mode employed two to three transitions per analyte. Calibration was conducted according to DIN 32645 over 1 to 1000 ng L with 95 percent confidence intervals.

Main Results and Discussion

The method achieved limits of detection between 0.1 and 4.2 ng L. Correlation coefficients exceeded 0.99 for most compounds in the low nanogram per liter range. Precision expressed as percent RSD was below 12 percent. Example MRM chromatograms demonstrated clear quantification at concentrations as low as 1 ng L. Direct injection proved robust with minimal matrix effects due to the divert valve.

Benefits and Practical Applications of the Method

• Simplified sample preparation without solid phase extraction
• Fast throughput suited for routine environmental monitoring
• Compliance with DIN regulations ensures data reliability
• High sensitivity enables detection below health orientation values

Future Trends and Potential Applications

Further expansion to emerging contaminants can broaden the method scope. Integration with high resolution mass spectrometry may enable non targeted screening. Automation of sample handling and real time monitoring platforms represent key developments. Data driven tools and artificial intelligence could enhance trend analysis and risk management.

Conclusion

The developed direct injection LC MS MS method provides reliable quantification of trace pharmaceuticals in surface water. Its simplicity and robustness make it ideal for routine laboratory use under regulatory frameworks.

Reference

1. Dieter HH International Journal of Hygiene and Environmental Health 217 117 132 2014
2. German Environmental Agency Health Orientation Values for Drinking Water Version June 2020
3. German Environmental Agency List of Evaluated Substances under GOW June 2020