JPS596439Y2 - liquid analyzer - Google Patents

Description

[Detailed description of the invention] The present invention relates to a liquid analyzer that indirectly analyzes a liquid sample by converting the liquid sample into a gas sample by some means and analyzing the obtained gas sample. .

Conventional devices of this type have poor reproducibility of 4 to 10% even when analyzing the same liquid sample.

An object of the present invention is to provide a liquid analyzer with excellent reproducibility.

The present invention will be explained in detail below with reference to the drawings.

FIG. 1 is a structural diagram showing an embodiment of a liquid analyzer according to the present invention.

In the figure, 1 and 2 are sample valves, and 3 is a carrier gas flow path switching valve.

These valves 1, 2.3 each have a switching flow path 1.
01-103, 201-203, and 301-303 are provided.

Reference numerals 4 and 5 indicate valves for controlling the backflush valve, and the valve 4 is provided with switching channels 401 and 402, and the valve 5 is provided with switching channels 501 and 502.

Each switching flow path of valves 1 to 5 is located at the position shown by the solid line in FIG. 1 when the valves 1 to 5 are in the ON state, and is located at the position shown by the broken line in FIG. 1 when the valve is in the OFF state.

Reference numeral 6 indicates an analysis section for performing gas analysis, 7 indicates a measuring tube attached to the sample valve 1, and 8 indicates a measuring tube attached to the sample valve 2.

9 is a liquid sample channel connected to the sample valve 1, and 901 and 902 are an inlet and an outlet, respectively.

10 is an empty pipe, 11 to 14 are columns, 15 is a capillary, and 16 is an inlet of a carrier gas line.

The carrier gas entering from this inlet port 16 is
5. It flows through a number of carrier gas lines connecting the analysis section 6 and the like.

The empty pipe 10 and columns 11 to 14 form part of these carrier gas lines.

Note that the valves 1 and 2, the empty pipe 10, etc. are placed in a constant temperature bath.

The operation of the device of the present invention constructed in this way is shown as a sequence of the following five operations (a) → (b) → (C) → (d) → (e), so it can be divided into each of these operations. I will explain.

(a) Operation when valves 1 to 5 are OFF In this case, the liquid sample reaches the metering tube 7 from the inlet 901 of the liquid sample flow path 9 through the switching flow path 101 of the valve 1, and after filling the inside thereof, From the switching channel 102 of the valve 1 flows to the outlet 902 of the liquid sample channel 9.

As a result, a constant amount (for example, 1
0 μl) of liquid sample will be present.

In this state, the carrier gas supplied to the valves 3, 2.5 takes the following flow paths (i) to (iii).

Flow path (i): Valve 3 → Column 11 → Valve 2 → Metering tube 8 → Valve 2 → Empty pipe 10 → Valve 1 → Valve 3 → Outlet (Vent) Flow path (ii): Valve 2 → Valve 4 → Column 12 → Valve 5 → Column 14 → Analysis part 6 Flow path (iii): Valve 5 → Column 13 → Valve 4 →
Capillary 15 → Vent (b) Operation when valves 1 and 3 are ON and valves 2 and 4.5 are OFF In this state, the population 901 of the liquid sample flow path 9
The liquid sample entering the valve 1 from the valve 1 is directly routed to the outlet 902 by the switching channel 101 of the valve 1 without passing through the metering tube 7.
sent to.

In addition, the carrier gas flow path (i) supplied to the valve 3
changes as follows.

Flow path (i): Valve 3 → Valve 1 → Metering tube 7 → Valve 1
→ Empty pipe 10 → Valve 2 → Metering tube 8 → Valve 2 → Column 11 → Valve 3 → Outlet Therefore, the liquid sample in the measuring tube 7 will be sent into the empty pipe 10 by the flow of this carrier gas.

Since the volume inside the empty pipe 10 is large, the liquid sample is vaporized within the empty pipe 10 and transferred to the measuring tube 8 as a gas sample.
It will fill you inside.

The concentration of a certain component in a fixed amount (for example, 360 μl) of a gas sample filling the measuring tube 8 changes with respect to time t, as shown in FIG. 2, for example.

After a period of time T has elapsed since the transition to operation b, the operation moves to operation C, which will be described next.

(C) Valve 2 is ON and valves 1, 3 to 5 are OFF
Operation in case of F In this state, the flow paths (i) and (ii) of the carrier gas supplied to the valves 3 and 2 change as follows.

Flow path (i): Valve 3 → Column 11 → Valve 2 → Empty pipe 10 → Valve 1 → Valve 3 → Outlet flow path (ii):
Valve 2 → Metering tube 8 → Valve 2 → Valve 4 → Column 12
→ Valve 5 → Column 14 → Analyzer 6 Therefore, backwashing is performed through channel (i), and the gas sample for channel (ii) is transferred to each column 12 as illustrated in FIG. It is separated every minute and sent to valve 5.

When the precepts to be analyzed pass through the valve 5, the next operation (d
).

(d) Valves 4 and 5 are ON, and valves 1 to 3 are OFF.
Operation in the case of F In this state, the flow path (i) is the same as the flow path (i) in the case of the above operation a.

Further, the flow paths (ii) and (iii) are as follows.

Flow path (ii): Valve 2 → Valve 4 → Column 13 → Valve 5 → Column 14 → Analyzer 6 Flow path (iii): Valve 5 → Column 12 → Valve 4 →
Capillary 15 → outlet Therefore, it is backlit by the flow path (iii) such as the column 12, and because of the flow path (ii), the fraction to be analyzed is separated in the column 14 as illustrated in FIG. It is sent to the analysis section 6.

Gas analysis is then performed.

After the gas analysis is completed, return to operation a and repeat the above operations.

This allows continuous analysis.

In addition, in the above explanation, an empty pipe 10 with a large inner diameter is used as a capacity part for vaporizing a liquid sample, but it is not limited to an empty pipe, and any pipe having a volume necessary for vaporization can be used. Alternatively, a carrier gas line with a large inner diameter may be used as the carrier gas line through which the liquid sample flows, and the entire Canoa gas line may be used as a capacity part, excluding the empty pipe 10 and the like.

As described above, the device of the present invention does not forcibly vaporize using a vaporizer or the like, but instead vaporizes a certain amount of liquid sample in the volumetric section and collects and analyzes a certain amount of the resulting gas sample. Because it is a 100% pure carburetor, there is no deterioration in reproducibility due to variations in the characteristics of the vaporizer, etc.

Also, after discharging the liquid sample from the liquid sample measuring tube,
Reproducibility can be further improved by collecting gas samples at regular intervals.

[Brief explanation of the drawing]

FIG. 1 is a structural diagram showing one embodiment of the liquid gas analyzer according to the present invention, and FIGS. 2 to 4 are explanatory diagrams for explaining the operation of the device shown in FIG. 1. 1-5...Valve, 6...Analysis section, 7
, 8...Measuring tube, 9...Liquid sample channel, 10...Empty pipe, 11-14...
...Column, 15... Capillary, 16...
...Carrier gas inlet.

Claims (1)

[Scope of utility model registration request] a first sampling means that has a first measuring tube and collects a liquid sample supplied to the first measuring tube; a capacity section that vaporizes and transports the sample liquid obtained by the first sampling means; and a second measuring tube. a second sampling means for sampling the gas supplied from the capacitor to the metering tube;
The first flow path includes an analysis section that analyzes the gas sampled by the sampling means, and a first flow path switching means that alternately switches and sends carrier gas to the first and second sampling means. A liquid characterized in that the gas flow rate in the second measuring tube is maintained at a constant value by arranging a column having a predetermined fluid resistance value between the switching means and the second sampling means. Analysis equipment.