Cadmium
is listed as a strong carcinogen by the international agency for
research on cancer, and it can be stored in the body for up to 10 to 30
years. It can cause diseases in organs such as kidneys, cause bone pain
and even affect the health of the next generation.
Cadmium
contamination in food has long been a problem, especially in southern
China where rice is the staple food, and the country has passed a food
hygiene law that sets the standard value.China
in October 2005 implementation of the “food pollution limits” mandatory
national standards, stipulated: the content of cadmium in white rice
cannot exceed 0.2 mg /KG.
Shanghai
precision spectrum technology co., ltd. is a professional production,
sales, development of X fluorescence analyzer company, has more than 20
years of production, sales and application experience, products
throughout the steel, cement, nonferrous mines, metallurgy,
environmental protection, alloy, food and other industries.In
view of the safety problem of cadmium content in rice, our company has
launched edx-800dm X fluorescence analyzer for the rapid determination
of cadmium in rice.
一．Product features
It can detect cadmium (Cd) and other harmful elements in food.
Rapid nondestructive testing, no need for complex sample preparation, as long as the simple crushing.
Rapid screening within 3 minutes and accurate quantification within 20 minutes.
Software powerful, intelligent design, simple and practical operation.
The environment of the instrument is stable and reliable.
No reagent consumables, green environmental protection, no secondary pollution to the environment.
二．Technical indicators
Element analysis range: s-u
Element analysis range: 0.03 PPM -99.99%
At the same time analysis: specially designed for food heavy metal cadmium, lead and other elements
Detection limit: detection limit of 0.03 PPM
Measuring objects: powder, solid and liquid
Measurement time: 200-2000s (adjust the length of time according to the level of test elements and content)
Resolution: as low as 127eV
三．Instrument parameters
| Instrument model | EDX-800DM |
| Analysis method | X-ray fluorescence analysis method |
| The probe * | The high speed SDD detector can count up to 500KCPS per second |
| Probe window area * | 30mm2 |
| Detector thickness * | Beryllium window thickness 7.5 m |
| Detector crystal thickness * | Semiconductor crystal thickness of 500 m |
| Energy resolution | Be able to reach 127 ev |
| Light tube and power | Transmission target tungsten target light tube, 65W |
| Data processing | Digital multichannel analyzer |
| Equipment light path | illuminated |
| Collimating system * | three，Φ2, 4，8mm |
| Detection limit | 0.03ppm |
| Test of time | Coarse screening for 3 minutes, accurate quantification for 20 minutes |
| Environmental protection | Physical processing, direct nondestructive testing |
| Analysis of the precision | RSD≤10%(Cd) |
| Sample weight requirement | More than 8 g |
| Cooling way | Four sets of air cooling equipment |
| Accessories | Portable balance (accuracy: 0.01g) |
| Cadmium-free sample cup |
| Test film, test film can be plastic film instead |
| Power cord, data cable, network cable |
| Computers, printers |
| Size and volume | Length 55cm× width 42cm× height 33cm |
| Weight of the | 30Kg |
| Working voltage | AC 220V |
| Working humidity | ≤80% |
| Working temperature | 20℃—30℃ |
| Communication interface | USB 、RS232、so |
| Software operating | Functional strength, simple operation, easy to use |
Examples of cadmium rice applications
Cadmium in rice is measured by simple material crushing method. After
crushing, 8 grams of samples are weighed and measured directly in a
plastic cup.
Accuracy comparison results
| Sample name | Cd(ppm) | Cd(ppm) | Error (PPM) | Date |
| 1 | 0.190 | 0.175 | -0.015 | 15-01-12-09:18 |
| 1 | 0.190 | 0.178 | -0.012 | 15-01-12-09:06 |
| 2 | 0.139 | 0.124 | -0.015 | 15-01-12-08:52 |
| 2 | 0.139 | 0.133 | -0.006 | 15-01-12-08:41 |
| 3 | 0.087 | 0.093 | 0.006 | 15-01-12-08:25 |
| 3 | 0.087 | 0.098 | 0.011 | 15-01-12-08:13 |
For national standard rice samples, repeated measurement data
(0.087 standard sample,1200 seconds)
| Number | Cd(ppm) | Time |
| 1 | 0.103 | 15-01-10-15:54 |
| 2 | 0.098 | 15-01-10-16:17 |
| 3 | 0.092 | 15-01-10-16:40 |
| 4 | 0.106 | 15-01-10-17:03 |
| 5 | 0.101 | 15-01-10-17:26 |
| 6 | 0.090 | 15-01-10-17:49 |
| 7 | 0.105 | 15-01-10-18:12 |
| 8 | 0.097 | 15-01-10-18:35 |
| 9 | 0.102 | 15-01-10-18:58 |
| 10 | 0.095 | 15-01-10-19:21 |
| 11 | 0.093 | 15-01-10-19:44 |
| 12 | 0.095 | 15-01-10-20:07 |
| 13 | 0.108 | 15-01-10-20:30 |
| 14 | 0.098 | 15-01-10-20:53 |
| 15 | 0.095 | 15-01-10-21:16 |
| 16 | 0.096 | 15-01-10-21:39 |
| 17 | 0.101 | 15-01-10-22:02 |
| 18 | 0.097 | 15-01-10-22:25 |
| 19 | 0.098 | 15-01-10-22:48 |
| 20 | 0.096 | 15-01-10-23:11 |
| Average | 0.098 |
|
| Maximum | 0.108 |
|
| Minimum value | 0.090 |
|
| poor | 0.018 |
|
| Relative error % | 18.311 |
|
| Standard deviation S | 0.00477 |
|
| RSD% relative standard deviation | 4.852 |
|
