Proficiency Tests
**Maleic hydrazide and ethephon are not accredited**
About the analytes
The fosetyl is an organophosphated compound used as a aluminum salt (Fosetyl-Al), this has fungal and bactericide activity 1 and is an allowed pesticide by the european legislation with an extended use in crops of fruit with seeds like pears, citrics and grape, to cite some of them 1,2,3.
Fosetyl tends to degrade to ethanol and phopshonic acid 1,3, this happens both in solution and also with the in-source fragmentation of the LC-MS/MS 4. To be taken into consideration is that phosphonic acic can suffer photodegradation in soil with the likely product being phosphate 3.
The current definition to expresse the amount of fosetyl in a sample is necesary to quantify its main metabolite, phosphonic acid, currently the pesticide residue for fosetyl is
Fosetyl-Al (sum of fosetyl, phophonic acid and its salts, expressed as fosetyl) 5.
Maleic hydrazide (MH) is a polar compound from the group of pyridazines 6. MH is also classified as a pesticide with activity as plant growth regulator and also as an herbicide 6. its use is also extended to most of the european union contries and its MRL can be found in the regulation modifying the annex II from Regulation (EC) No 396/2005 7.
The etephon LMR can be checked in the COMMISSION REGULATION (EU) 2015/399 of 25 February 2015 which is found here: EU LEX link
Summary of the proficiency test
All the information about this PT can be found in the protocol, which can be donwloaded from a link located below, in this page.
This proficiency test will consist in a single round, two samples will be distributed at the same time with both the PT item with approximately 200g and a blank item. The target standard desviation for all the analytes is 25%.
For this PT the parameters to be analysed are:
|
Fosetyl |
|
Phosphonic acid |
|
Fosetyl-Al (sum of fosetyl, phosphonic acid and its salts expressed as fosetyl) |
|
Maleic Hydrazide (*) |
|
Ethephon (*) |
Parameters marked with an asterisk (*) are not accredited by ENAC
TestQual keeps confidential the levels of concentration but it can be expected at the level of residues.
PT Scheduled milestones
| Deadline to send applications | 30/Oct/20 (Week 44) |
|---|---|
| Distribution of samples | 17/Nov/20 (Week 47) |
| Deadline to return results | 04/Dec/20 (Week 49) |
| Issue of the final report | 18/12/20 (Week 51) |
*These dates are orientative and always will have to be checked in the protocol of the PT and the news in our webpage.
Why participate? Is the PT accredited?
·Accredited PT in the UNE-EN ISO/IEC 17043:2010. Parameters marked with an asterisk are not accredited by ENAC. Not accredited: Maleic hydrazide and Etephon. Check our scope of accreditation here.
·Growing number of participants each year.
It can be of great interest for laboratories to be able to analyze and obtain trusted results, for this reason this TestQual proficiency tests (PT) are a perfect chance to compare and contraste your results with participants from around the world. Keeping a continous quality control gives your results the reliability that your clients need for their products and helps your laboratoryto improve continuously while detecting bias or errors that can be corrected with proper corrective or preventive actions.
One participation can help to highligh possible errors in the parameters from this proficiency test, however the real value of TestQual's PTs lies in a continous participation that will allow to track the quality of the results and detect tendencies in your analysis over the time and check if they have been correctly solved.
How to apply
Those laboratories that want to participate and are not registered on our website can register through this link: START REGISTRATION
If your laboratory is already registered on our website you can start your applciation by clicking the link situated at the bottom of this page, in APPLICATION FORM, once you have logged in you will have to enter your Limit of Quantification (LOQ) for the parameters that have to be studied. The analytes with LOQ equal to NA (NOT ANALYSED) will NOT appear in the website when submiting the results of the PT.
Once the application has been sent, as soon as possible you will receive an email with your laboratory code for the participation in the PT.
If you would like to receive a quote, down below you can find the contact data.
Contact data
If you have any doubt, if you want to get a quote or if we can help you in any other way, you can contact us by:
| Email: | jpnavarro@testqual.com |
|---|---|
| Office phone: | (+34) 868-94-94-86 |
| Mobile phone: | (+34) 676-367-555 |
