JPH05234566A - Sample liquid atomizing device - Google Patents

Abstract

PURPOSE:To provide a sample liquid atomizing device, which maintains the optimal atomizing condition and prevents the fluctuation of the measuring sensitivity. CONSTITUTION:One end of a most outside cylinder 12 provided in the periphery of an outer cylinder 1 concentrically in outline is narrowed and formed with a blow-out port 10 in the tip thereof. The bottom part 11 of the most outside cylinder 12 is fitted to the periphery of the outer cylinder 1, and the any gas is sent from a gas lead-in pipe 9 to a space S' between the outer cylinder 1 and the most outside cylinder 12 through a control valve 16, and is blown out form the blow-out port 10. With this structure, quantity of the gas led in from a gas lead-in pipe 6 is controlled by a control valve 15 to make the diameter of the atomization drop constant, and quantity of the gas of the gas lead-in pipe 9 is controlled by a control valve 16 to make the total flow quantity of the gas at an eject port constant to maintain the temperature of the plasma in a torch constant. As a result, fluctuation of the measuring sensitivity can be prevented without changing a degree of ionization.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an optimum sample liquid atomizer for use in a high frequency inductively coupled plasma device (ICP).

[0002]

2. Description of the Related Art In recent years, ICP and mass spectrometer (MS)
IC-MS coupled with an optical emission spectrometer (AES)
And ICP-AES have been put to practical use.

Such an ICP uses a plasma to ionize the sample solution. At this time, as a method for introducing the sample solution into the plasma, a nebulizer as shown in FIG. 1 is used to atomize the sample solution. There is a method of ejecting it into plasma.

In the figure, 7 is a spray chamber, and the sample atomized by the nebulizer 14 opening in the spray chamber 7 is sent from a take-out port 8 to a plasma torch (not shown). Droplets generated by colliding with the wall surface of the spray chamber are drained from the drain port 13. Outer cylinder 1 of nebulizer 14
Is finely squeezed, and the atomizing gas ejection port 2 is formed at the tip,
The other end of the outer cylinder 1 is closed by the bottom portion 3. An inner cylinder 4 is arranged substantially concentrically inside the outer cylinder 1, one end of which is placed close to the ejection port 2 and the other end of which is fixed to the bottom portion 3. The inner cylinder 4 is configured to communicate with the sample supply pipe 5 fixed to the outside of the bottom portion 3, and any gas is supplied from the atomizing gas introduction pipe 6 via the gas introduction amount adjusting valve 15 to the outer cylinder. 1 is jetted toward the jet port 2 through a gap S formed between the inner cylinder 1 and the inner cylinder 4. Further, generally, each of these members is formed using quartz glass having excellent heat resistance.

In such a structure, the gas introduction amount adjusting valve 15 and the atomizing gas introduction pipe 6 are supplied from a gas cylinder (not shown).
When the argon gas introduced through the nozzle 2 is ejected through the gap S of the outer cylinder 1 by the ejection port 2 and the sample liquid is introduced into the inner cylinder 4 from the sample supply pipe 5, the sample liquid is ejected through the ejection port 2
After being atomized by the argon gas ejected from, it is taken out from the outlet 8 and sent into the plasma torch (not shown) for ionization.

[0006]

In such a device, for example, when the viscosity of the sample liquid introduced into the sample supply pipe 5 of the nebulizer changes, the gas introduction amount is adjusted so as to maintain the optimum atomized state. The valve 15 adjusts the flow rate of atomizing gas. By adjusting the flow rate of the atomizing gas in this way, the flow rate of the gas introduced into the plasma torch (not shown) changes, and the temperature of the gas in the plasma changes due to this change in the flow rate, resulting in ionization or excitation of the sample. The result is that the measurement sensitivity is changed and the data reproducibility is reduced.

Therefore, the present invention has been made in view of the above problems, and maintains an optimum atomization state, and
It is an object of the present invention to provide a sample liquid atomizing device that can prevent fluctuations in measurement sensitivity.

[0008]

In order to achieve the above object, the present invention provides a nebulizer that atomizes a sample liquid with a gas ejected from an atomization gas ejection port, and a spray chamber that houses the nebulizer. In a sample liquid atomizing device, which is equipped with an atomizing sample from an outlet provided in the spray chamber, sprays an atomized sample transporting gas for sending the atomized sample toward the outlet. It is characterized in that an ejection port to be supplied to the chamber is provided in the vicinity of the atomizing gas ejection port of the nebulizer.

[0009]

According to the present invention, a spray port is provided in the vicinity of the atomizing gas spray port of the nebulizer, and the atomized sample transporting gas for sending the atomized sample from the spray port to the spray port is supplied to the spray chamber. I am trying to introduce it.

[0010]

Embodiments of the present invention will be described below with reference to the drawings.

In FIG. 2, the same components as those in FIG. 1 are designated by the same reference numerals. In the figure, reference numeral 12 is an outermost cylinder provided substantially concentrically on the outer circumference of the outer cylinder 1, and one end thereof is narrowed down to form a jet port 10 at the tip. The outermost cylinder 12
Is attached to the outer circumference of the outer cylinder 1 by fusion or the like, and any gas sent from the gas introduction pipe 9 passes through a gap S ′ formed between the outer cylinder 1 and the outermost cylinder 12. It is ejected from the ejection port 10.

In such a structure, as described above, when the viscosity of the sample liquid becomes high, the measurer sets the first gas introduction amount adjusting valve of the atomization gas introduction pipe 6 so as to achieve the optimum atomization state. By turning 15 in the opening direction, the amount of gas introduced from a gas cylinder (not shown) is increased. Further, the measurer turns the second gas introduction amount adjusting valve 16 of the gas introduction pipe 9 in the closing direction to reduce the gas introduction amount introduced from the gas cylinder (not shown), so that the jet port 10 and the jet port 2 The total flow rate of the ejected gas is adjusted to be constant.
That is, since the gas introduction amount from the atomized sample transporting gas introduction pipe 9 is reduced by the amount of the gas introduction amount increased by the introduction pipe 6, a certain amount of gas is directed toward the ejection port 8 of the spray chamber 7. Sent. On the contrary, when the viscosity of the sample liquid becomes low, the first gas introduction amount adjusting valve 15 is turned in the closing direction,
Since the amount of atomization gas introduced is reduced to achieve the optimum atomization state, in this case, the second gas introduction amount adjustment valve 16 is rotated in the opening direction so that the total gas flow rate is constant. Is adjusted to

As a result, even if the liquidity of the sample liquid changes, the optimum atomization state can be maintained and the total flow rate of the gas taken out from the outlet of the spray chamber can be made constant. The flow rate of the gas introduced is also constant. As a result, the temperature change of the gas in the plasma torch can be prevented, so that ionization and
It is possible to prevent variation in measurement sensitivity without changing the degree of excitation. Further, by providing the atomized sample transporting gas outlet coaxially with the outer periphery of the atomizing gas outlet as in the above embodiment, the atomized sample transporting gas is ejected so as to enclose the atomized sample. Therefore, the collision of the atomized sample with the inner wall of the spray chamber is reduced, and the loss of the atomized sample caused by the collision can be reduced.

In the above embodiment, the outer cylinder 1 of the nebulizer is used.
An outermost cylinder was provided on the outer circumference of the outermost cylinder in a substantially concentric manner to supply the gas for transporting the atomized sample.However, the outermost cylinder is not limited to this, and may be mounted in the vicinity of the nebulizer. The gas introduction pipe may be arranged at another position.

Further, in the above embodiment, the gas introduction amounts of the gas introduction pipes 6 and 9 are adjusted to the first and second gas introduction amount adjusting valves 1.
Although it has been described that the nebulizers are separately adjusted in 5 and 16 and supplied to the nebulizer, the present invention is not limited to this, and the two gas introduction amount adjusting valves are interlocked so that the total gas flow rate of the gas introducing pipes 6 and 9 becomes constant. It may be allowed to.

Further, although the argon gas is introduced from the gas introducing pipe 9 in the above embodiment, the present invention is not limited to this, and if another gas having high thermal conductivity is introduced from the gas introducing pipe 9, the sample in the plasma The temperature can be raised, and the ionization is further promoted. Also, the gas introduction pipe 9
A gas that causes a chemical reaction with the sample may be introduced and reacted in the spray chamber so that the product is ionized in the plasma torch, or the temperature of the gas introduced from the gas introduction pipe 9 is variable. You can

Although the coaxial nebulizer has been described in the above embodiment, the present invention is not limited to this, and a cross-flow nebulizer may be used.

[0018]

As described in detail above, according to the present invention, by providing a gas outlet for transporting atomized sample near the atomizing gas outlet of the nebulizer, the total flow rate of gas sent to the outlet can be made constant. can do. This makes it possible to maintain an optimum atomization state and prevent fluctuations in measurement sensitivity.

[Brief description of drawings]

FIG. 1 is a diagram for explaining a conventional example.

FIG. 2 is an enlarged view of a main part of an apparatus according to an embodiment of the present invention.

[Explanation of symbols]

 9 Atomized sample transportation gas introduction pipe 10 Atomized sample transportation gas ejection port 11 Bottom 12 Outermost cylinder 16 Second gas introduction amount adjusting valve S'Gap

Claims (1)

[Claims] 1. A nebulizer for atomizing a sample liquid with a gas ejected from an atomizing gas ejection port, and a spray chamber for accommodating the nebulizer, the atomization being performed from an outlet provided in the spray chamber. In the sample liquid atomizing device for taking out the sample, the atomizing gas outlet of the nebulizer is an atomizing gas outlet for supplying the atomizing sample transporting gas to the spray chamber for sending the atomized sample to the outlet. A sample liquid atomizing device, which is provided in the vicinity of the.