Low-pressure water-cooled inductively coupled plasma torch

Patent · Tue Dec 27 04:00:00 EST 1988

OSTI ID:866806

Seliskar, Carl J ^[1]; Warner, David K ^[2]

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1. Cincinnati, OH
2. Centerville, OH

An inductively coupled plasma torch is provided which comprises an inner tube, including a sample injection port to which the sample to be tested is supplied and comprising an enlarged central portion in which the plasma flame is confined; an outer tube surrounding the inner tube and containing water therein for cooling the inner tube, the outer tube including a water inlet port to which water is supplied and a water outlet port spaced from the water inlet port and from which water is removed after flowing through the outer tube; and an r.f. induction coil for inducing the plasma in the gas passing into the tube through the sample injection port. The sample injection port comprises a capillary tube including a reduced diameter orifice, projecting into the lower end of the inner tube. The water inlet is located at the lower end of the outer tube and the r.f. heating coil is disposed around the outer tube above and adjacent to the water inlet.

• Research Organization: MONSANTO RESEARCH CORP
• DOE Contract Number: AC04-76DP00053
• Assignee: United States of America as represented by United States (Washington, DC)
• Patent Number(s): US 4794230
• Application Number: 06/580,983
• OSTI ID: 866806
• Country of Publication: United States
• Language: English

Related Subjects

/219/315/356/
adjacent
capillary
capillary tube
central
central portion
coil
comprises
comprising
confined
containing
containing water
cooling
coupled
coupled plasma
diameter
disposed
enlarged
flame
flowing
gas
gas passing
heating
heating coil
including
inducing
induction
induction coil
inductively
inductively coupled
injection
inlet
inner
inner tube
located
low-pressure
orifice
outer
outer tube
outlet
passing
plasma
plasma torch
portion
pressure water
projecting
provided
reduced
reduced diameter
removed
sample
sample injection
spaced
supplied
surrounding
tested
therein
torch
tube
tube including
tube surrounding
water
water inlet
water outlet
water-cooled