The standard “BGI 505-23 Analytical method for detecting carcinogenic n-nitrosamines in workplace air” describes a standardized analytical method developed in Germany for determining the concentrations of n-nitrosamines, a group of highly carcinogenic substances found in workplace air. This method is part of a broader series of guidelines published by German trade associations to protect workers from exposure to carcinogenic substances.
N-nitrosamines are chemical compounds composed of amines and nitrosating agents that are commonly found in industries such as rubber production, metal processing (e.g., cutting fluids), leather tanning, and chemical manufacturing. These compounds are classified as carcinogenic to humans and can cause cancers such as lung, bladder, or esophageal cancer through inhalation or absorption through the skin.
The BGI 505 series of standards provides recognized analytical methods for monitoring carcinogenic substances in workplace air, ensuring compliance with occupational exposure limits and health protection regulations under German law (e.g., TRGS 552 on N-nitrosamines). The BGI 505-23 standard, specifically targeting N-nitrosamines, offers a reliable way to perform instantaneous measurements via stationary or individual sampling.
The main characteristics of this method are as follows:
This procedure has been updated as industries have evolved and newer methods have emerged. It continues to be used as a reference in technical regulations such as TRGS 552 for the measurement of N-nitrosamines in air and material samples. Modern alternatives may include updated techniques, but the fundamental principles of reliable and accurate detection remain valid.
These types of standards are crucial for preventing occupational cancers, which account for a significant proportion of work-related illnesses in industrial sectors. Regular monitoring using methods such as the BGI 505-23 standard helps employers implement controls (e.g., ventilation, handling of hazardous materials) and comply with regulations.
This technical guide exemplifies efforts to protect workers from hidden chemical risks in the field of industrial hygiene, reflecting years of research on workplace exposure to carcinogens.
N-nitrosamines are a class of chemical compounds considered potent carcinogens. Even at low concentrations in workplace air, they pose significant health risks, primarily due to inhalation exposure (direct entry into the respiratory system and systemic absorption).
Most N-nitrosamines are classified as known or probable human carcinogens. Many specific compounds, such as N-nitrosodimethylamine (NDMA), N-nitrosodiethylamine (NDEA), and others, are in probable human carcinogens or related groups. The U.S. Environmental Protection Agency (EPA) classifies several as probable human carcinogens.
Nitrosamines are not directly carcinogenic, but they require metabolic activation in the body (via enzymes) to form reactive alkylating agents. These agents damage DNA by alkylating bases, leading to mutations and cancer.
Human data from occupational groups (e.g., rubber and tire workers) show that high exposure is associated with an increased risk of esophageal, oral/pharyngeal, prostate, and other cancers.
Here are some reasons why respiratory exposure in the workplace is particularly dangerous:
Testing for N-nitrosamines in workplace air is vital for occupational health monitoring, particularly in sectors such as rubber production, metal processing, leather tanning, and chemical manufacturing. These methods focus on sensitive detection due to low exposure limits. The standard approach involves highly specific analyses following active sampling.
The primary sampling technique uses adsorption tubes/cartridges. Air is pumped through a solid sorbent to capture volatile nitrosamines (typically 1-2 L/min). Thermosorb/N cartridges are commonly used for personal or stationary sampling. The sample volume is usually 50-400 L, depending on the expected concentrations. This allows for both personal sampling (worker breathing zone) and stationary/area sampling.
The primary analytical technique is gas chromatography with a thermal energy analyzer. After sampling, nitrosamines are eluted (e.g., with a dichloromethane/methanol mixture). The thermal energy analyzer detector is highly selective for N-nitroso compounds, breaking the N-NO bond and detecting chemiluminescence from nitric oxide. Detection limits are typically 0,01–0,04 µg/m³ per nitrosamine. It covers multiple nitrosamines simultaneously.
The basic standardized methods are as follows:
These methods are reliable, accurate, and widely accepted for compliance and risk assessment.
For many years, our organization, with its competent and experienced staff, has been understanding the needs of its clients, providing the advanced testing services they require, and assisting them in the establishment, implementation, and improvement of management systems. Within this framework, we also provide testing services compliant with the BGI 505-23 standard.
To get an appointment, to get more detailed information or to request an evaluation, you can ask us to fill in our form and reach you.
