JPH0670610B2 - Atomic absorption spectrophotometer - Google Patents

Description

TECHNICAL FIELD The present invention relates to an atomic absorption spectrophotometer, and more particularly to an atomic absorption spectrophotometer capable of switching between a so-called flame system and a frameless system in an atomization section.

(Prior Art and Its Problems) In atomic absorption spectrometry, there are two methods for atomizing a sample using thermal dissociation. The first method is called a flame atomization method, and is a method of burning a flame with a burner for atomization. The second method is called a flameless atomization method, and is a method in which a large current is passed through a graphite tube for atomization.

As described above, since there are two methods for atomizing the sample, the conventional atomic absorption spectrophotometer was manufactured as a dedicated machine for each of the flame method and the flameless method, and a dual-purpose machine that can use both. Has been done. And for the dual-purpose machine,
There are a system in which only the atomization part is replaced, and a system in which both atomization parts are arranged on the same optical axis. However, the former device has the advantage that the device is compact, but on the other hand, when switching from frame measurement to frameless measurement or vice versa, it is necessary to attach / detach the atomization part, so switching work is not required. It has the drawback of being troublesome. On the other hand, the latter device has the drawbacks that both atomization parts are arranged on the same optical axis, so that the device becomes large in size and expensive.

(Object of the Invention) The present invention has been made to solve the above problems, and provides an atomic absorption spectrophotometer which can easily perform switching work between flame measurement and flameless measurement, and has a compact device and inexpensive. The purpose is to

(Means for Achieving the Object) In order to achieve the above-mentioned object, the atomic absorption spectrophotometer of the present invention determines the light beam passage direction of the frame in the left-right direction and supports the first atomization portion on the support base. Then, a position adjusting mechanism for moving and adjusting the first atomization portion in the front-back direction perpendicular to the height direction and the light beam passing direction is provided, and the light beam passing direction of the electric furnace is set to be parallel to the light beam passing direction of the frame. The second atomization part is detachably attached to the first atomization part at a position lower than the first atomization part and at a position apart from the first atomization part when viewed from the optical axis.

(Embodiment) FIG. 1 shows a perspective view of an atomic absorption spectrophotometer which is an embodiment of the present invention, FIG. 2 shows its front view, and FIG. 3 shows the same side view thereof. 4 and 5 are exploded perspective views of FIG. 1, that is, FIG. 4 is a perspective view showing a state in which a frame-type atomizing unit is supported by a support base, and FIG. 5 is a frame. The perspective view of the atomization part of a less system is shown.

As shown in FIG. 4, the support base 1 is constructed by mounting a movable plate 3 on a support frame 2 so as to be slidable in the front-rear direction (X direction). A female screw 4 extending in the front-rear direction is formed on the front piece 2a of the support frame 2, and a front-rear adjusting screw 5 is screwed to the female screw 4, and the screw tip is rotatably connected to the front end 3a of the movable plate 3. It Therefore, the movable plate 3 can be moved and adjusted in the front-back direction (X direction) along the support frame 2 by rotating the front-back adjustment screw 5.

The frame-type atomization part 6 has a shaft part 8 on the rear end side of the main body 7.
The burner head 9 is attached via the. The burner head 9 is capable of finely adjusting the amount of rotation in the axial direction of the shaft portion 8, and a screw 10 for restricting rotation after the fine adjustment is provided on the shaft portion 8 side. A bearing hole 11 is bored in the central portion of the upper surface of the main body 7, screw receiving mounting holes 12a, 12b are bored in the front end portion of the upper surface of the main body 7, and a scale indicator piece 13 is provided in the rear end portion of the side surface of the main body 7. It is projected. Further, a rotary shaft 14 is formed on the lower surface of the main body 7, and a female screw (not shown) having a downward opening is formed inside the rotary shaft 14.

On the other hand, a height adjusting screw 15 is attached to the central portion of the movable plate 3 so as to be rotatable around a vertical axis. Further, a rotation restricting member 16 is provided upright on the rear portion of the movable plate 3, and the rotation restricting member 16
A notch 16 corresponding to the cross-sectional shape of the main body 7 is provided at the upper end of the
a is formed. Then, in the state in which the atomization portion 6 is fitted with the rear portion of the main body 7 into the cutout portion 16a of the rotation restricting member 16,
The male screw 15a of the height adjusting screw 15 is screwed onto the female screw of the rotary shaft 14. If the height adjusting screw 15 is rotated in this state, the rotation of the atomizing part 6 about the vertical axis is restricted by the rotation restricting member 16, and the light flux passing direction of the frame 29 is maintained substantially in the left-right direction (Y direction). In this state, it is possible to adjust the atomization part 6 up and down in the height direction (Z direction). In this case, in order to accurately set the light flux passing direction of the frame 29 in the left-right direction (Y direction), loosen the screw 10 and burner head 9
After adjusting the height, the screw 10 may be tightened again. After adjusting the height, if the screw 17 provided on the peripheral body of the rotary shaft 14 is tightened, the height adjusting screw 15 The rotation of can be regulated and the atomization part 6 can be held at a desired height.

On the other hand, as shown in FIG. 5, in the atomization section 20 of the frameless system, the upper piece 21a and the front side piece 21b of the main body 21 are formed in a reverse L-shaped cross section, and the graphite is formed on the upper surface of the upper piece 21a. An electric furnace 22 containing a tube and the like is arranged. Further, the front side piece 21b of the main body 21 is formed with a notch 23 having a size larger than the cross-sectional shape of the main body 7 (see FIG. 4). Also, the upper piece 21
A rotation shaft (not shown) corresponding to the bearing hole 11 (Fig. 4) is provided in the center of the lower surface of the, and a rotation amount adjusting projection 24 protruding forward from the center of the upper piece of the notch 23 is provided. It is attached to the main body 21.

When attaching the atomization part 20 to the atomization part 6, as shown in FIG. 1, using screw receiving attachment holes 12a and 12b (FIG. 4) on the upper surface of the main body 7 of the atomization part 6. Screw receiver 25a, 25b
And the fine adjustment screws 26a and 26b are screwed to the screw receivers 25a and 25b. Then, the main body 21 is engaged with the notch 23 so that the main body 21 straddles the main body 7, and the upper piece 21a
A rotary shaft (not shown) protrudingly provided on the lower surface of the rotary body is rotatably fitted into the bearing hole 11 (FIG. 4) on the upper surface of the main body 7, and the front end of the rotation amount adjusting projection 24 is fixed to the fine adjustment screw. It is located between 26a and 26b. As a result, the light flux passage direction of the electric furnace 22 is aligned substantially in the left-right direction (Y direction). In this case, in order to accurately align the light flux passing direction of the electric furnace 22 in the left-right direction (Y direction), the rotation amount adjusting projection 2 with the left and right fine adjusting screws 26a, 26b.
This can be done by rotating the screws 26a and 26b while sandwiching 4 from both sides to rotate the main body 21 with a rotating shaft (not shown) protruding on the lower surface of the upper piece 21a as a fulcrum.

2 and 3, the optical axis A with respect to the frame 29 is shown.
, And the optical axis B for the electric furnace 20 is shown.
Since the optical axis of the actual light source is immovable, it is necessary to align the optical axis A of the frame 29 with the optical axis of the light source during frame measurement, and the optical axis of the electric furnace 22 is aligned with the optical axis of the light source during frameless measurement. It is necessary to align the optical axis B. Therefore,
The procedure for switching from frame measurement to frameless measurement will be described below. Frame measurement
Since the optical axis A of 29 is already aligned with the optical axis of the light source, it is necessary to move the optical axis B of the electric furnace 22 to the current position of the optical axis A in order to switch to the frameless measurement. For that purpose, since the electric furnace 22 is located farther from the optical axis than the burner head 9, the front-back adjusting screw 5 is rotated to move the movable plate 3 backward by a distance corresponding to the front-back distance between A and B. Also, since the electric furnace 22 is located at a position lower than the burner head 9 (rightward in FIG. 3), the height adjusting screw 15 is rotated to move the atomizing parts 6 and 22 to the vertical distance between A and B. This can be done by raising the corresponding distance. Similarly, by performing the reverse operation, it is possible to switch from frameless measurement to frame measurement.

As described above, according to this device, the frame measurement and the frameless measurement can be switched by simply rotating the front-rear adjustment screw 5 and the height adjustment screw 15, and the atomization unit can be changed as in the conventional case. Compared to the detachable type, switching work becomes easier. Further, since the atomization unit 20 is placed on the atomization unit 6, the device can be made compact and inexpensive.

If the attachment mate 28 shown in FIG. 6 is used, the atomization part 20 is removed from the atomization part 6 and the attachment 28 is removed.
It can also be used as a dedicated atomic absorption spectrophotometer for the frameless method.

Further, in the above-mentioned embodiment, the atomization portions 6 and 22 are configured to be separable, but they may be configured as one body.

(Effects of the Invention) As described above, according to the atomic absorption spectrophotometer of the present invention, it is possible to easily perform the switching work between the flame measurement and the flameless measurement, and to obtain the effects that the device is compact and inexpensive.

[Brief description of drawings]

FIG. 1 is a perspective view of an atomic absorption spectrophotometer according to an embodiment of the present invention, FIG. 2 is a front view thereof, FIG. 3 is a side view of the same, and FIG. FIG. 5 is a perspective view showing a state of being supported by a base, FIG. 5 is a perspective view of a frameless atomizing section, and FIG. 6 is a perspective view of an attachment. 1 ... Support base, 5 ... Front-back adjustment screw 6 ... Flame atomization unit 9 ... Burner head, 15 ... Height adjustment screw 20 ... Frameless atomization unit 22 ... Electric furnace, 29 …… Frame

Claims (1)

[Claims] 1. A support base, a first atomization part supported on the support base by setting a light beam passage direction of a frame in a lateral direction, and a height direction and a light beam passage direction of the first atomization part. A position adjusting mechanism that is movable in the front-rear direction perpendicular to the axis, and a light beam passing direction of the electric furnace is set to be parallel to the light beam passing direction of the frame, and is located at a position lower than the first atomization section and viewed from the optical axis. An atomic absorption spectrophotometer, comprising: a second atomization section detachably attached to the first atomization section at a position distant from the first atomization section.