Electrothermal method and Cold vapour cells:
In a few instruments atom reservoirs made of graphite are used. These are known as non- flame cells and are in the shape of a bowl, in that the solid sample could be vapourised through a high current pulse. The atomisation is achieved through electrothermal methods. Within these cells argon gas is used to surround the sample so as to decrease fluorescence quenching. You would learn about graphite furnace. An electrothermal method of atomisation has benefits that an extremely small volume of the sample is needs and the sensitivity is quite high.
Cold vapour cells are used for the determination of mercury and includes the conversion of dissolved mercury within elemental mercury through reacting it along with SnCl2. The elemental mercury so acquired is then transported within a quartz cell along with the help of gas flow .This quartz cell acts as the atom cell or reservoir. The easy design, low cost and high sensitivity are a few of the benefits of these cells.