Digestion of Petroleum Products for Element Analysis with ICP

Rotor 20SVT50 in Multiwave 5000 allows for safe and convenient digestion of reactive petroleum products at elevated temperatures.

Petroleum laboratories are mostly using traditional methods for trace metal analytics. Only recently the awareness for closed vessel microwave acid digestion has been rising. Difficult to digest and reactive materials demand sophisticated and fast responding process control with either rapid release of excess reaction gases (SmartVent) or reliable pressure increase detection (Rotor 8NXF100).

In traditional closed vessel acid digestion the reaction pressure generated by the amount of sample limits the achievable temperature. Thus, venting of excess reaction gases is a safe and convenient way to overcome this limitation and being able to handle higher sample amounts.

Rotor 20SVT50 in Multiwave 5000 provides the already well-established SmartVent technology at an advanced pressure level and allows the controlled release of reaction gases. This ensures that higher digestion temperatures can be reached and excellent quality of digestion even for hard to digest samples is achieved.

The SmartTemp temperature sensor of Multiwave 5000 quickly and accurately measures the internal temperature, which is especially important to reliably control reactive samples.

With up to 20 samples in one single run Rotor 20SVT50 offers unrivaled efficiency. Refined products like fuels, lubricants or waxes are challenging due to their high reactivity and energy content, but their mostly aliphatic composition allows digestion at around 200 °C already. However, “black” products such as marine fuels, fuel oils and to a lesser extent also crude oils contain higher amounts of condensed “polycyclic” aromatic compounds and thus require higher temperatures. A well accepted strategy to heighten the oxidation power is to open and degas the vessel after a first digestion run to add a small amount of additional oxidant like perchloric acid or hydrogen peroxide and perform a second run.

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