CN104111248A - Sampling needle used for determining elements in soil filtrate - Google Patents

Abstract

A sampling needle used for determining elements in soil filtrate, the invention relates to a sample injector in an analysis instrument, and is mainly aimed at inductively coupled plasma atomic emission spectrum, atomic absorption and emission spectrum, and flame photometer. The invention aims to solve the problem of filtering out dander in the solution and suspended matter in the soil during analysis of the soil filtrate. A sampling needle for determining elements in soil filtrate comprises a liquid inlet needle, a connecting pipe, a liquid inlet hose, a finger-tight joint, a filter membrane, a filter screen and a plastic hose. The needle end of the liquid inlet needle of the sampling needle is provided with a filter screen, and a filter membrane is provided at the connection between the hand-tight joint of the connecting hose and the connection of the plastic hose, which plays a double filtering role and can be cleaned with an ultrasonic cleaning agent; it can be replaced, The operation is simple and practical. The invention is used for determining elements in soil filtrate.

Description

A sampling needle for determining elements in soil filtrate

technical field

The invention relates to a sample injector in an analysis instrument, and is mainly aimed at an inductively coupled plasma atomic emission spectrum, an atomic absorption and emission spectrum, and a flame photometer.

Background technique

At present, the sampling needle of the automatic sample injector is generally installed on the mechanical arm of the automatic sample injector. Through the vertical downward movement of the mechanical arm, the sampling needle enters the sample cup and contacts the sample solution to achieve the purpose of automatic and accurate quantitative sampling.

In recent years, with the application of spectral technology in agricultural detection, especially the application of inductively coupled plasma in the analysis of soil metal elements, the detection accuracy and efficiency have been improved. However, in the analysis of large quantities of soil metal elements, the soil filtrate is often obtained by filtering with filter paper instead of centrifuging and centrifuging. Therefore, there will be dander of filter paper and suspended matter in the soil in the soil filtrate, which is easy to cause The blockage of the atomizer caused the flameout of the inductively coupled plasma yard emission spectrometer, which affected the accuracy and precision of the detection data and affected the progress of the experiment.

Contents of the invention

The invention solves the problem of filtering out dander in the solution and suspended solids in the soil during analysis of the soil filtrate, thereby providing a sampling needle for determining elements in the soil filtrate.

A sampling needle for determining elements in soil filtrate includes a liquid inlet needle, a connecting pipe, a liquid inlet hose, a finger-tight joint, a filter membrane, a filter screen and a plastic hose, wherein the liquid inlet needle is connected to the liquid inlet soft tube through the connecting pipe. The liquid inlet end of the pipe is connected, and one end of the plastic hose is connected with the connection end of the liquid inlet hose through a hand-tight joint.

The beneficial effect of the present invention is that: the needle end of the liquid inlet needle of the sampling needle is provided with a filter screen, and a filter membrane is provided at the joint where the hand-tight joint of the connecting hose is connected to the plastic hose, which plays the role of double filtration, and when the filter screen When it is blocked by debris, it can be cleaned with an ultrasonic cleaning agent; when the filter membrane is blocked by debris, it can be replaced. The operation is simple and practical, and it solves the problem of filtering out dander in the solution and suspended matter in the soil during the analysis of the soil filtrate. question. The sampling needle has a double filter device to ensure that the dander and soil suspension in the soil filtrate are filtered clean during the sampling process, which can not only ensure the accuracy of the measurement data but also effectively reduce the damage to the equipment.

The invention is used for determining elements in soil filtrate.

Description of drawings

Fig. 1 is a schematic diagram of a sampling needle used for determining elements in soil filtrate described in Embodiment 1, wherein 1 represents the liquid inlet needle, 2 represents the connecting pipe, 3 represents the liquid inlet hose, 4 represents the hand-tight joint, and 5 represents the Filter membrane, 6 represents filter screen, 7 represents plastic hose, 3-1 represents liquid inlet end, 3-2 represents connection end;

FIG. 2 is a schematic diagram of the filter screen 6 .

Detailed ways

The technical solution of the present invention is not limited to the specific embodiments listed below, but also includes any combination of the specific embodiments.

Embodiment 1: In this embodiment, a sampling needle for determining elements in soil filtrate includes a liquid inlet needle 1, a connecting pipe 2, a liquid inlet hose 3, a hand-tight joint 4, a filter membrane 5, a filter screen 6 and a plastic soft Pipe 7, wherein the liquid inlet needle 1 communicates with the liquid inlet hose 3 inlet 3-1 through the connecting pipe 2, and one end of the plastic hose 7 communicates with the connection end 3-2 of the inlet hose 3 through the hand-tight joint 4 A filter membrane 5 is provided inside the hand-tight connector 4, and a filter screen 6 is provided at the needle end of the liquid inlet needle 1.

Embodiment 2: This embodiment differs from Embodiment 1 in that the filter membrane 5 is a Coriolis SELROMPS-U20P acid and alkali resistant ultrafiltration membrane. Others are the same as in the first embodiment.

The Coriolis SELROMPS-U20P acid and alkali resistant ultrafiltration membrane of this embodiment meets the application requirements of high and low pH values (0-14), high temperature (maximum withstand temperature 70°C) and organic solvent media in the test, and has ultra- Strong stability.

Embodiment 3: This embodiment is different from Embodiment 1 in that: the liquid inlet hose 3 is a polyvinyl chloride pipe or polytetrafluoroethylene. Others are the same as in the first embodiment.

Embodiment 4: This embodiment differs from Embodiment 1 in that: the connecting end 3-2 of the liquid inlet hose 3 is processed with grooves. Others are the same as in the first embodiment.

In this embodiment, the connecting end 3-2 of the liquid inlet hose 3 is processed with a groove to ensure that the plastic hose will not slip off from the connecting end of the liquid inlet pipe

Embodiment 5: This embodiment differs from Embodiment 1 in that: the inner diameter of the liquid inlet hose 3 is 1.0 mm to 1.5 mm, the outer diameter is 1.0 mm to 2.0 mm, and the wall thickness is 0.2 mm to 0.5 mm. Others are the same as in the first embodiment.

Embodiment 6: This embodiment differs from Embodiment 1 in that: the inner diameter of the liquid inlet hose 3 is 1.0 mm to 2.0 mm, the outer diameter is 1.5 mm to 2.0 mm, and the wall thickness is 0.2 mm to 0.5 mm. Others are the same as in the first embodiment.

Adopt the following examples to verify the beneficial effects of the present invention:

Embodiment one:

In this embodiment, a sampling needle for determining elements in soil filtrate includes a liquid inlet needle 1, a connecting pipe 2, a liquid inlet hose 3, a hand-tight connector 4, a filter membrane 5, a filter screen 6 and a plastic hose 7, wherein, The liquid inlet needle 1 communicates with the liquid inlet end 3-1 of the liquid inlet hose 3 through the connecting pipe 2, and one end of the plastic hose 7 communicates with the connection end 3-2 of the liquid inlet hose 3 through the hand-tight joint 4, and the inside of the hand-tight joint 4 A filter membrane 5 is provided in the center, and a filter screen 6 is provided at the needle end of the liquid inlet needle 1;

Among them, the filter membrane 5 is Coriolis SELROMPS-U20P acid and alkali resistant ultrafiltration membrane, the liquid inlet hose 3 is a polyvinyl chloride pipe, the connection end 3-2 of the liquid inlet hose 3 is processed with grooves, and the liquid inlet hose 3 The inner diameter is 1.5mm, the outer diameter is 2.0mm, and the wall thickness is 0.25mm.

Claims (6)

1. one kind for measuring the sampling needle of soil filtrate element, it is characterized in that a kind ofly comprising feed liquor syringe needle (1) for measuring the sampling needle of soil filtrate element, connecting pipe (2), feed liquor flexible pipe (3), hand-tight joint (4), filter membrane (5), filter screen (6) and plastic flexible pipe (7), wherein, feed liquor syringe needle (1) is communicated with feed liquor flexible pipe (3) liquid feeding end (3-1) by connecting pipe (2), one end of plastic flexible pipe (7) is communicated with the link (3-2) of feed liquor flexible pipe (3) by hand-tight joint (4), hand-tight joint (4) inside center is provided with filter membrane (5), the needle end of feed liquor syringe needle (1) is provided with filter screen (6).

2. according to claim 1 a kind of for measuring the sampling needle of soil filtrate element, it is characterized in that filter membrane (5) is Coriolis SELROMPS-U20P acid and alkali-resistance ultra filtration membrane.

3. according to claim 1 a kind of for measuring the sampling needle of soil filtrate element, it is characterized in that feed liquor flexible pipe (3) is polyvinyl chloride pipe or teflon.

4. according to claim 1 a kind of for measuring the sampling needle of soil filtrate element, it is characterized in that being processed with groove on the link (3-2) of feed liquor flexible pipe (3).

5. according to claim 1 a kind of for measuring the sampling needle of soil filtrate element, the internal diameter that it is characterized in that feed liquor flexible pipe (3) is 1.0mm～1.5mm, and external diameter is 1.0mm～2.0mm, and wall thickness is 0.2mm～0.5mm.

6. according to claim 1 a kind of for measuring the sampling needle of soil filtrate element, the internal diameter that it is characterized in that feed liquor flexible pipe (3) is 1.0mm～2.0mm, and external diameter is 1.5mm～2.0mm, and wall thickness is 0.2mm～0.5mm.