JPH05296933A - Icp emission spectrophotometer - Google Patents

Abstract

PURPOSE:To increase the sample aerosol generating amount of the title analyzer so as to improve the detection sensitivity of its plasma torch without sharply increasing the manufacturing cost of the analyzer. CONSTITUTION:In the analyzer provided with an ultrasonic nebulizer 1, a plurality of ultrasonic vibrators 7 to which a liquid sample S is respective supplied and confluence section 5 through which the sample aerosols generated from the vibrators 7 join together and flow to a single plasma torch 2.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an ICP (high frequency inductively coupled plasma) emission spectroscopic analyzer, and more specifically, it has an ultrasonic nebulizer and a plasma torch into which a sample aerosol is introduced from the ultrasonic nebulizer. The present invention relates to an ICP emission spectroscopy analyzer.

[0002]

2. Description of the Related Art Some ICP emission spectroscopic analyzers are those in which a liquid sample is aerosolized by an ultrasonic nebulizer and introduced into a plasma torch.

FIG. 3 shows the structure of the main part of a conventional ICP emission spectroscopic analyzer of this type. Referring to the figure, 21 is an ultrasonic nebulizer and 22 is a plasma torch.

The ultrasonic nebulizer 21 comprises a nebulizer body 23 for atomizing a liquid sample by ultrasonic vibration, and a desolvation section 24.

The nebulizer body 23 is provided with an ultrasonic vibrator 26 in the atomizing chamber 25. The carrier gas is introduced into the atomizing chamber 25 through a carrier gas inlet pipe 27 and ultrasonic vibration is generated. On the surface of the child 26, the liquid sample S is sent from the sample container 28 through the supply pipe 30 by the drive of the pump 29, the liquid sample S is atomized by the vibration of the ultrasonic transducer 26, and the sample aerosol is released together with the carrier gas. It is delivered to the solvent section 24.

The desolvation section 24 includes a heating stage 24a at the front stage,
In the heating stage 24a, the sample aerosol from the nebulizer body 23 is heated and dried to be fine particles, and in the cooling stage 24b, the vaporized solvent is condensed and removed from the sample aerosol by cooling.

The sample aerosol thus passing through the desolvation section 24 is conveyed to the plasma torch 22.

[0008]

By the way, the ultrasonic nebulizer, when compared with the nebulizer of the mist blowing type,
A sample aerosol with a small particle size can be obtained, and
Although there is an advantage that the amount of sample aerosol can be adjusted regardless of the supply amount of carrier gas, the conventional one has
Since there is a limit to the amount of sample aerosol that can be generated, it is not possible to sufficiently meet the demand for increasing the amount of sample aerosol generated and increasing the detection sensitivity.

On the other hand, it is conceivable to use a high-power ultrasonic vibrator for the ultrasonic nebulizer to increase the amount of sample aerosol generated, but such an ultrasonic vibrator is very costly. However, it is difficult to use for a device as an actual product.

Therefore, in the present invention, it is possible to increase the amount of the sample aerosol generated by the ultrasonic nebulizer and increase the detection sensitivity of the plasma torch without significantly increasing the cost. Is an issue.

[0011]

In order to achieve the above object, the present invention provides an ICP emission spectroscopic analyzer having an ultrasonic nebulizer and a plasma torch into which a sample aerosol is introduced from the ultrasonic nebulizer. The ultrasonic nebulizer includes a plurality of ultrasonic vibrators to which a liquid sample is supplied, and a confluence unit for converging sample aerosols generated by the ultrasonic vibrators and introducing the sample aerosols into the plasma torch. It is characterized by

[0012]

According to the above construction, since the sample aerosols generated on the surfaces of the plurality of ultrasonic transducers are merged at the merging portion and introduced into the plasma torch, each ultrasonic transducer has a small output. Even if there is, a large amount of sample aerosol is obtained as a whole, and since this is introduced into the plasma torch, highly sensitive detection is possible.

[0013]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The details of the present invention will be described below based on the illustrated embodiments.

Example 1 FIG. 1 is a block diagram showing the configuration of the main part of an ICP emission spectroscopic analyzer according to Example 1 of the present invention.

As described with reference to FIG. 1, the first embodiment
Basically, the ICP emission spectroscopic analyzer of No. 1 is equipped with an ultrasonic nebulizer 1 and a plasma torch 2, and
The ultrasonic nebulizer 1 includes a nebulizer body and a desolvation unit 4
The point consisting of and is the same as the conventional example described above,
It is similar to the conventional example that the desolvation unit 4 is composed of a heating stage 4a in the front stage for heating the sample aerosol from the nebulizer body and a cooling stage 4b in the rear stage for cooling the heated sample aerosol.

The structure of the ICP emission spectroscopic analyzer according to the first embodiment, which is different from the conventional one, is
In the ultrasonic nebulizer 1, a plurality (3 in the illustrated example
Individual) nebulizer bodies 3A, 3B, 3C are provided in parallel, and each nebulizer body 3A, 3B, 3
This is because the sample aerosol generated in C is merged in the merging section 5, and then is introduced into the single desolvation section 4 and introduced into the plasma torch 2.

Looking at each of the nebulizer bodies 3A, 3B and 3C, as in the conventional nebulizer body 23, all of them are provided with an ultrasonic transducer 7 in the atomizing chamber 6, and each atomizing chamber 6 has a corresponding one. A carrier gas inlet pipe 8 and a liquid sample S supply pipe 9 are connected in communication with each other, and the carrier gas is fed into each atomization chamber 6 through the corresponding carrier gas inlet pipe 8. The liquid sample S from the sample container 10 is fed to the surface of each ultrasonic transducer 7 through the corresponding supply pipe 9 by driving the pump 11.

Each carrier gas inlet pipe 8 is provided with a flow rate adjusting valve 12, and the valve 12 controls the amount of carrier gas supplied to each atomizing chamber 6 individually.

In the above structure, each nebulizer body 3
In A, 3B, and 3C, the liquid sample S is supplied to the surface of the ultrasonic oscillator 7, so that the liquid sample S is aerosolized by the ultrasonic vibration of the ultrasonic oscillator 7.

The sample aerosols generated in the nebulizer main bodies 3A, 3B and 3C are respectively discharged from the outlet of the atomization chamber 6, but are combined at the confluence section 5 and flow into the desolvation section 4 and the desolvation section 4 It is conveyed to the plasma torch 2 via the solvent section 4. In this way, since the sample aerosols generated by the ultrasonic transducers 7 are merged at the merging portion 5, even if each ultrasonic transducer 7 has a small output, a large amount of sample aerosol is generated as a whole. Since it is obtained and introduced into a single plasma torch 2, high-sensitivity detection with the plasma torch 2 is possible.

Embodiment 2 FIG. 2 is a sectional view of a nebulizer body according to Embodiment 2 of the present invention. In Example 1, a nebulizer body 3A (or 3B, 3C) provided with one ultrasonic transducer 7 in one atomization chamber 6 is shown as shown in FIG. In the second embodiment, as shown in FIG. 2, a nebulizer body 3D having two ultrasonic transducers 7, 7 in one atomizing chamber 6 may be configured. In the nebulizer main body 3D, the sample aerosols generated by the ultrasonic transducers 7 are mixed in the atomization chamber 6 and flow into the desolvation section through the outlet 6a. Therefore, in the second embodiment, the atomization chamber 6 also functions as a confluence portion for the sample aerosol. A single carrier gas inlet pipe 8 and two liquid sample supply pipes 9, 9 are connected to the atomization chamber 6 for communication. 13 is a cooling block.

In the first embodiment, as shown in FIG. 1, the same liquid sample S is supplied from the single sample container 10 to each of the nebulizer bodies 3A, 3B and 3C. Different liquid samples S may be supplied to the respective nebulizer main bodies 3A, 3B, 3C from the sample container of No. 3, in which case the analysis by the standard addition method can be easily performed.

[0023]

As described above, according to the present invention, a large amount of sample aerosol can be introduced into the plasma torch by joining the sample aerosols generated by a plurality of ultrasonic vibrators. The detection sensitivity of the plasma torch can be increased by supplying the sample aerosol of.

Moreover, since it is not necessary to use a high-power ultrasonic transducer, a low-power ultrasonic transducer may be used as in the conventional case, resulting in a significant increase in cost. Will disappear.

[Brief description of drawings]

FIG. 1 is a configuration diagram of a main part of an ICP emission spectroscopy analyzer according to a first embodiment of the present invention.

FIG. 2 is a sectional view of a nebulizer main body according to a second embodiment of the present invention.

FIG. 3 is a configuration diagram of a main part of an ICP emission spectral analyzer according to a conventional example.

[Explanation of symbols]

 1 Ultrasonic nebulizer 2 Plasma torch 3A, 3B, 3C Nebulizer body 4 Desolvation part 5 Confluence part 6 Atomization chamber 7 Ultrasonic transducer

Claims (1)

[Claims] 1. An ICP emission spectroscopic analyzer having an ultrasonic nebulizer and a plasma torch into which a sample aerosol is introduced from the ultrasonic nebulizer, wherein the ultrasonic nebulizer is provided with a plurality of liquid samples supplied to each of them. An ICP emission spectroscopic analyzer comprising: an ultrasonic oscillator; and a merging unit that merges sample aerosols generated by the ultrasonic oscillators and introduces the sample aerosol into the plasma torch.