Maintenance of Graphite Furnace Atomization Atomic Absorption Spectroscopy Systems

可以选择使用石墨炉雾化组件以及火焰版本，用于分析原子吸收光谱系统上的痕量金属。Graphite Furnace Atomic Absorption Spectroscopyhighlights the features and benefits of this option. In order to get highest levels of reliability of results regular maintenance is an absolute must. An earlier article –Tips to ensure high uptime of your Atomic Absorption Spectrometerproposes some guidelines on maintenance of flame AAS systems.

Low-level trace metal determinations require use of graphite furnace atomization assembly. The present article makes some suggestions for maintenance of graphite furnace systems. The overall maintenance of graphite systems can be carried out routinely by you but for some tasks expert handling by service engineer of instrument supplier becomes necessary.

Routine Maintenance

Routine maintenance involves mostly visual observation which can be made easily before making use of the assembly. It can take at the most about 10 – 15 minutes but it is worth the time spent as you can rest assured on the reliability of reported results.

Graphite Tube

The graphite tube is the most critical component in the furnace assembly. Visually inspect daily for cracks, deformations, pitting or deposits around the injection hole. In case such damage is observed tube replacement is the best option.

天然气供应

在利用该设施之前，请确保氩气的供应足够。输出供应压力应保持在50 - 60 psig之间。

Light Source

The hollow cathode lamp or electrodeless discharge lamp在使用之前应该有足够的剩余寿命。打开灯后，应给予足够的时间稳定。空心阴极灯可能需要半小时才能提供稳定的输出，并且无电排放灯可能需要更长的稳定时间。在将样品引入石墨管之前，应审查灯泡状态的稳定输出。

接触Rings

像石墨试管一样，还应检查触点戒指因点缀或裂缝而造成损坏。如果注意到任何此类损坏，现在该更换戒指了。

Autosampler Tubing and Probe

The tubing should be inspected for any bends or kinks. The tube should be clean and if any blockages are observed or kinks develop the best solution is to replace the tubing. Similarly the probe should be cleaned or replaced if it gets blocked.

Expert Maintenance

Expert attention is required at least once or twice a year depending on usage and nature of samples analyzed. Such recommendations include:

• 清洁机械组件
• 清洁任何固体沉积物的光窗
• 检测灵敏度的校准ainst traceable standards
• 如果有的话，应检查冷却系统是否有阻塞，如果发现cho住的过滤器，则应清洁。如果无法清洁，则应更换过滤器

在PPB浓度范围内进行低水平测定需要石墨炉组件。在这样的水平下，结果的可重复性可能会受到几个因素的影响，这取决于试剂，采样和分析方法中的错误。但是，作为底线的预防性维护，可帮助您确保在设施的有用寿命中确保结果的可靠性。