Rubidium silicates

The most common selective detectors in use generally respond to the presence of a characteristic element or group in the eluted compound. This is well illustrated by the thermionic ionisation detector (TID) which is essentially a flame ionisation detector giving a selective response to phosphorus- and/or nitrogen-containing compounds. Typically the TID contains an electrically heated rubidium silicate bead situated a few millimetres above the detector jet tip and below the collector electrode. The temperature of the bead is maintained... 

Rubidium hydroxide, 27 821-822 Rubidium iodide, 27 823 Rubidium metal alloys, 27 816 Rubidium metal, pure, 27 818 Rubidium oxides, 27 816, 823 Rubidium ozonide, 78 417 Rubidium silicates, 22 452 Rubidium sulfate, 27 821 Rubidium superoxide, 78 417 Rubidium tetrahydroborate physical properties of, 4 194t Ruby, 2 405 color, 7 329 Ruby glass, 7 344... 

Thermal conductivity detector (c) Rubidium silicate bead... 

As its name implies, nitrogen/phosphorus detector (NPD) is sensitive to nitrogen and phosphorus compounds. The detector is similar to an FID, but uses a heated rubidium silicate bead in place of a hydrogen/air flame to generate ions. Nitrogen-and phosphorus-containing compounds such as pesticides cause the bead to emit... 

Compton and Purdy [16] refashioned the FID of the Pye Uni cam Modified moving wire detector by inserting a rubidium silicate glass bead above the flame and thus made its response specific and changed it into a nitrogen phosphorus detector. 

OsRb2Si2 (s) Rb20 2Si02 (s) Rubidium Silicate 05Rb2Si2 (s) Rb20 2Si02 (s)... 

OsRb2Si2 (I) Rb20 2Si02 (I) Rubidium Silicate OgRb2Si2 (I) Rb20 2Si02 (I)... 

Rubidium silicate bead Specific for nitrogen- and phosphorus-containing substances Excellent Mass sensitive... 

The nitrogen-phosphorus detector (NPD) is also called the alkali flame ionization detector (AFID), or thermionic NPD if no flame is used. The flame NPD is similar to the FID, but with an additional unit, usually a rubidium silicate bead, which is heated by an electrical current (Figure 2.9). When a compound enters the detection compartment, the ion current for compounds containing N or P increases. The mechanism for N detection may briefly described by the following ... 

The neutral Rb atoms that have evaporated from the heated rubidium silicate react with the cyano (or phospho for P detection) radicals, the Rb ions are neutralized on... 

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