Analysis of Polycyclic Aromatic Hydrocarbons (PAHs) in Tattoo Inks Using GC-MS

Significance of the Topic

Tattoo inks are directly introduced into the dermal layer, raising concerns about trace contaminants such as polycyclic aromatic hydrocarbons (PAHs), known for their carcinogenic and mutagenic properties. Ensuring the safety of these pigments is crucial for consumer health and regulatory compliance.

Objectives and Study Overview

This study presents a validated analytical workflow for quantifying eight priority PAHs in tattoo inks, following the South Korean MFDS standards (Notice 2025-36). The aim is to demonstrate the suitability of the GCMS-QP2020 NX system for sensitive, accurate, and compliant PAH analysis.

Methodology and Instrumentation

Sample preparation and analysis involved:

• Weighing 1 g of tattoo ink and adding 20 µL of benzo[a]pyrene-d12 internal standard plus 10 mL toluene.
• Vortex mixing and sonication at 60 °C for 1 h.
• SPE cleanup using a 70 mL XTR-SPE cartridge conditioned with toluene; loading the extract and eluting PAHs with eight 20 mL portions of toluene.
• Concentration to ~1 mL by rotary evaporation, filtration through a 0.45 µm PTFE filter, and GC-MS injection.

Instrumentation details:

• Nexis-GC2030 with SH-35 capillary column (30 m×0.25 mm, 0.25 µm film); oven ramp from 90 °C to 280 °C.
• GCMS-QP2020 NX mass spectrometer in SIM mode targeting characteristic m/z values for each PAH and the deuterated internal standard.

Main Results and Discussion

Calibration and line-of-sight performance:

• Seven-point calibration (0.002–0.2 mg/L) yielded R²>0.999 for all analytes.

Recovery and precision:

• Recoveries ranged from 81.6 % to 115.1 % across low (0.005 mg/L), medium (0.02 mg/L), and high (0.1 mg/L) spiking levels.
• Relative standard deviations were below 3.13 %, demonstrating robust accuracy and repeatability even at trace concentrations.

Benefits and Practical Applications

The proposed method offers:

• High sensitivity and selectivity for regulatory compliance with MFDS and EU REACH limits.
• Reliable quality control for manufacturers and testing laboratories.
• Applicability to routine safety monitoring of tattoo and permanent makeup products.

Future Trends and Potential Applications

Emerging directions include:

• Extending the method to additional organic contaminants and pigment matrices.
• Automated, high-throughput sample preparation to support large-scale screening.
• Integration with non-targeted HRMS workflows for broader safety assessment.

Conclusion

The GCMS-QP2020 NX platform, combined with a straightforward extraction and SPE cleanup, provides a precise, accurate, and regulation-compliant approach for quantifying PAHs in tattoo inks. This workflow supports consumer safety and industry quality requirements.

Reference

• (EU) REACH 2020/2081 regulation on hazardous substances in inks.
• Korean MFDS Notice 2025-36: Standards and Specifications for Sanitary Products.