Pyrolytically coated graphite cuvettes

The lifetime of TPCs is much longer than pyrolytically coated or normal graphite tubes. Figure 60 shows peak shapes for vanadium and platinum using totally pyrographite cuvettes, pyrolytically coated cuvettes, and electrographite cuvettes. The TPC peak is narrower and appears earlier than the peaks of the other cuvette types. 

Organic solvents have low surface tensions and easily wet and soak into the graphite. As they become warm, they tend to spread out over the cuvette. Because of these phenomena, smaller sample volumes and pyrolytic-ally coated cuvettes are generally used with organic solvents. 

---