AFS-200 typeSequential injection atomic fluorescence spectrophotometerIt has a simple design structure, high sensitivity, low detection limit, wide applicability, and can simultaneously determine multiple elements. It can easily form hydrides.Heavy metal elements in gaseous components and atomic vapors.
Sequential injection atomic fluorescence spectrophotometerThe application fields are very extensive, involving teaching research, health and epidemic prevention, medical clinical testing, drug testing, food hygiene testing, urban water supply and drainage testing, agricultural product testing, beverage testing, environmental monitoring, cosmetics testing, metallurgical sample testing, geological survey monitoring, etc.

1. Purpose

Teaching research, health and epidemic prevention, medical clinical testing, drug testing, food hygiene testing, urban water supply and drainage testing, agricultural product testing, beverage testing, environmental monitoring, cosmetics testing, metallurgical sample testing, geological survey testing, etc. Used for trace analysis of twelve elements including As, Sb, Bi, Hg, Se, Te, Sn, Ge, Pb, Zn, Cd, and Au in samples.

Model Description:

AFS-200 type, semi-automatic sequential injection dual channel atomic fluorescence

AFS-200 model, fully automatic sequential injection dual channel atomic fluorescence (equipped with a 200 position automatic sampler)

2. Technical indicators

2.1 Detection limit DL:

As、Se、Pb、Bi、Sb、Te、Sn<0.01μg/L

Hg、Cd<0.001μg/L

Ge<0.05μg/L

Zn<1.0μg/L

Au<3.0μg/L

2.2 Relative standard deviation RSD<1%

2.3 Linear range: greater than three orders of magnitude

2.4 Inter channel interference: ≤± 1%

2.5 Noise: ≤ 1%

2.6 Drift: ≤ 2%

3. Main technical features

3.1 This model features a dual channel design that allows for simultaneous measurement of two elements. Both channels come with enhanced functionality and can be upgraded to four channels according to different customer needs.

3.2 The element lamp is automatically recognized by an encoder, equipped with a file management and anti-counterfeiting recognition device for light source consumables. It adopts a high-frequency pulse power supply method, automatically triggers the ignition, and monitors the lamp current in real time.

3.3 The element lamp is designed with a 45 ° angled slope to reduce interference between light sources and has the advantage of low background and high signal. The original high-performance element lamp is plug and play.

3.4 Adopting an imported injection pump and peristaltic pump combined with a built-in dual injection system

3.4.1 The injection pump adopts imported glass syringes, and under the premise of meeting the experimental conditions, the service life: the piston syringe made of UHMWPE material can reach more than 800000 cycles. Within the lifespan of the syringe, it has * stable quantitative suction and discharge accuracy, repeatability accuracy<1%, and suction and discharge accuracy<1%. The injection pump can accurately control the solution injection volume, with a minimum injection volume of 0.01ml. It can automatically configure the standard curve, and automatically dilute the standard series solution from the solution at the highest concentration point to no less than 8 points. The single point automatic standard curve r>0.9995 avoids human influence on inaccurate factors when configuring the standard solution. Online automatic dilution of high concentration unknown samples, automatic dilution when the unknown sample exceeds the highest concentration of the standard curve, improves the efficiency and quality of experiments. At the same time, it also achieves the measurement of elements with strict requirements for the acidity and alkalinity of hydride reactions (Pb, Cd, Sn, etc.), which is also suitable for the detection of precious samples.

3.4.2 The peristaltic pump adopts ten rollers, four channels, and each channel can be adjusted separately. The peristaltic pump card has a gear color code prompt function, which can quickly distinguish the gear in which the peristaltic pump is working, avoiding confusion between gears and saving operation time. The peristaltic pump injection system has the characteristic of fast sample measurement speed (less than 20 seconds for a single sample measurement), which shortens the detection time and improves work efficiency. Suitable for the detection of turbid and complex matrix samples. The software can select the injection process and switch automatically.

3.4.3 The peristaltic pump tube is made of 100% imported original packaging and does not undergo manual secondary processing. The service life of one original pump tube is more than twice that of conventional pump tubes.

3.5 The injection process adopts electromagnetic pulse clamp valve technology, replacing traditional electromagnetic valve technology, which can achieve zero dead volume and effectively prevent cross contamination. The fixing method of the pipe fittings is safe and reliable, does not obstruct the flow path, and can adapt to different chemical corrosion resistance requirements. It has low energy consumption/high heat dissipation efficiency, and a service life of up to 2 million times. The clamp used is a special silicone tube with good memory performance, and the tube will not stick together after a long time of closure. The elasticity of special silicone tubing ensures at least 100000 continuous opening and closing operations.

3.6 Equipped with drift compensation function, automatically optimizing element lamp drift to ensure instrument stability; Continuous measurement of arsenic antimony standard solution for 4 hours, with a maximum drift of no more than 2%. It is possible to set n samples per interval to retest the current carrying blank, with a maximum deviation of no more than 10% from the initial current carrying blank fluorescence value. The mercury lamp is automatically activated and does not require the use of auxiliary tools to ignite after prolonged use.

3.7 Adopting the technique of eliminating inter channel interference, during the measurement process, the hollow cathode lamp is powered by a constant current pulse power supply and alternately lit to excite atomic fluorescence signals of different elements, achieving the goal of simultaneous measurement of multiple elements, eliminating the influence on the next channel signal, and ensuring the accuracy and reliability of each data.

3.8 Atomizer: Shielded low-temperature ignition quartz furnace atomizer with argon hydrogen flame observation window, capable of real-time monitoring of flame status.

3.9 Adopting a dual gas-liquid separation device:

The primary gas-liquid separator has the function of quickly removing foam to prevent the reaction solution from entering the atomizer; There is a check valve in the carrier gas path to prevent the reaction solution from entering the gas path;

Secondary gas-liquid separator: adopting a new device for removing water vapor, without the need for adding water or manual drainage;

It can achieve full pipeline cleaning, including primary gas-liquid separator, secondary gas-liquid separator, and hydride transmission pipeline, to avoid residual reaction system and pipeline crystallization. When using an automatic sampler, the cleaning process has an emptying function.

3.10 Gas system: capable of real-time display of gas flow rate and abnormal flow rate prompts, as well as safety protection for unloaded gas; After the test is completed, turn off the gas and enter the gas saving mode. The gas circuit will automatically open during sample preparation.

3.11 Detector: Photomultiplier tube, with a lifespan of over 10 years.

3.12 Optical System: Short focal length lens focusing, non dispersive closed optical system, and device for removing stray light.

3.13 The instrument has two detection modes, low sensitivity and high sensitivity, which are suitable for detecting samples of different concentrations.

3.14 Software System: After entering the software, the system automatically resets, the instrument functions self check, has memory function to automatically read the previous condition settings, has misoperation prompt function, carrier gas alarm function, automatic ignition function, can store measurement spectra in real time, injection system selection function, with one click measurement function, automatic sampler can set the probe depth of the injection needle, has batch printing function, can classify and print instrument conditions, sample information, standard samples, and unknown samples in batches. Chinese operating software suitable for any Windows system.

3.15 The software can set blank discrimination values, monitor blank cleaning, compare the reaction before and after sampling, and automatically determine whether the flow path is clean.

3.16 Measures shall be taken to remove harmful gases from exhaust gas using a trap device, reducing physical harm to operators and minimizing environmental pollution.

3.17 Optional 206 bit 3D disc automatic sampler, including 200 10ml sample cups and 6 50ml large volume sample cups. The sample tray can also be used to place 10mL and 50mL stoppered colorimetric tubes, achieving the same container for sample processing and measurement, effectively avoiding secondary pollution caused by transfer.

3.18 The automatic sampler has a cleaning function for the injection needle: it cleans the inner/outer walls to reduce cross contamination, and has an emptying function.

3.19 Automatic sampler coordinate method: Adopting an independent coordinate setting method instead of the traditional interval calculation method, each sample grade can be individually set with coordinates, greatly reducing the failure rate and improving analysis efficiency. Positioning accuracy: ± 0.5mm, positioning repeatability: 0.3mm, maximum sample retention:<0.1%.

The 3.20 automatic sampler has air isolation function, and the sample and carrier liquid are isolated by a small volume of air to better prevent contamination. The default isolation volume is 8 μ l.

3.21 Optional upgrade adopts an integrated carbon fiber injection needle, which adopts a locking structure at both ends. The material in contact with the reagent is PTFE material, which has strong resistance to strong acids, bases, and organic solvents. The skeleton is made of improved carbon fiber material, which has certain strength and is easy to clamp and fix. This injection needle can avoid the risk of liquid leakage caused by secondary connection of the pipeline, as well as the problem of glass tubes being prone to breakage, breakage, and liquid hanging.

3.22 has an upgradable element morphology testing interface, which can detect the valence states of elements such as arsenic (As), mercury (Hg), selenium (Se), antimony (Sb) after upgrading, and automatically switch between total amount and morphology.