Preferencje help
Widoczny [Schowaj] Abstrakt
Liczba wyników

Znaleziono wyników: 35

Liczba wyników na stronie
Pierwsza strona wyników Pięć stron wyników wstecz Poprzednia strona wyników Strona / 2 Następna strona wyników Pięć stron wyników wprzód Ostatnia strona wyników

Wyniki wyszukiwania

help Sortuj według:

help Ogranicz wyniki do:
Pierwsza strona wyników Pięć stron wyników wstecz Poprzednia strona wyników Strona / 2 Następna strona wyników Pięć stron wyników wprzód Ostatnia strona wyników
Studies on the decay of folpet, triadimenol and tetraconazole residues in apple fruits after their application against diseases were carried out. The studies were carried out in apple orchard situated in Budziwój the district of Rzeszów. According to test 1 the level of detected residues of folpet, triadimenol and tetraconazole directly after the treatments were respectively: 1.22±0.608; 0.065±0.22 and 0.067±0.023 mg/kg. The results of test 2 revealed that the folpet and triadimenol residues amounted to 1.671±0.430 and 0.082±0.012 mg/kg. In test 3 the detected level of tetraconazole was 0.034±0.007 mg/kg. On the basic of obtained results concerning the period of fungicide residue decay, it can be stated that fungicides containing folpet, triadimenol and tetraconazole used in apple orchards to protect apple fruits (intended for baby food production) against fungal diseases should be applied not later than 2 months before harvest.
In order to reduce the level of dithiocarbamate fungicide mancozeb residues in blackcurrants, two different ozone treatment procedures were evaluated. The first one entailed washing the plant material with an aqueous solution of ozone. This ozone enriched water solution allowed for a 59% reduction of mancozeb residues, compared with the initial concentration. The latter method was based on the utilization of ozone in a gaseous phase combined with a drying process. In that procedure, samples of blackcurrant fruit were exposed to a 19 ppm ozone concentration, and then the blackcurrants were dried. The utilization of ozone in a gaseous phase permitted a 38% reduction of mancozeb residues, in comparison with the initial concentration. As a result of the combination of both processes; ozonation and drying, a 58% reduction of mancozeb residues was achieved.
In 2010 161 samples of plant origin were analysed. All the samples were intended for export to the Russian Federation. Total issued 111 safety certificates for fruit and vegetables exported to the Russian Federation. Violations of Russian MRLs were detected in 37 of analysed samples and violations of nitrates were detected in 12 samples. In 5 samples of apple boscalid was detected, which was not recommended for control of that kind of crop. In 3 samples of apple the usage of not approved pesticide were stated: diazinon, tolylfluanid and fenitrothion.
Background. Fruit and vegetables have health and nutritional value, but can also be a source of toxic contaminants such as pesticide residues. Objective. The aim of this study was to evaluate presence of pesticide residues in fruit and vegetable crops from the central and eastern region of Poland in order to check the compliance of these products with the maximum residue levels’ (MRLs) requirements set in legal EU regulation for products present in the market. Material and methods. Samples of fruit and vegetables were obtained from production farms as a part of an official premarket monitoring of pesticide residues conducted on behalf of the Ministry of Agriculture and Rural Development, implemented in cooperation with the regional Inspectorates of Plant Health and Seed Inspection. The tests covered determination of 207 pesticides. Results. In 2014, a total of 317 samples of fruit and vegetables, collected from the central and eastern region of Poland, were analysed for the presence of pesticide residues. Pesticide residues were detected in 89 (28.1%) analysed samples: in 65 (38.2%) samples of fruit, and in 24 (16.3%) samples of vegetables. MRLs were exceeded in 2 samples (0.6%). Most often, the pesticide residues were found in gooseberry (100% of gooseberry samples) and apple (71.4%). Conclusions. Monitoring of pesticide residues in the agricultural crops at premarket stage should be continued to prevent market from the penetration by products with non-acceptable residues of pesticides and to protect consumers against excessive exposure to pesticide residues.
Studies on disappearance of captan, trifloxistrobin, cyprodinil and fludioxonil residues in fruits and leaves after their application against diseases were carried out. The initial deposits of cyprodinil and fludioxonil in fruits were on the levels 0.236±0.064 and 0.294±0.039 mg/kg, respectively, and disappeared more quickly than those of captan. However their residues during harvest were still significantly higher than 0.01 mg/kg. Quite similar behaviour was found to be in the case of trifloxistrobin initial deposits. Results of the studies indicated that the apples could not be used for baby food production.
Studies on disappearance of myclobutanil, kresoxim-methyl and flusilazole residues in fruit and leaves of apple trees of Idared variety were carried out. Kresoxim-methyl disappeared the most quickly. The initial deposits of that fungicide on fruits and leaves disappeared by half in 8 and 10 days, respectively. Four weeks after treatment residues of kresoxim-methyl in fruits and leaves were on the level of 0.014±0.001 mg/kg and 0.059±0.021 μg/cm2, respectively. The initial deposits of flusilazole and myclobutanil in fruits and leaves were on the low level and then disappeared slowly. One month after treatments residues of those fungicides in fruits were on the level about 0.01 mg/kg. Results of the studies indicate that, in the case of apples destined for baby food production, plant production products with: myclobutanil, kresoxim-methyl and flusilazole should be applied not later than 6 weeks before harvest.
In 2006–2010 analysis of 204 samples of feed of plant origin were carried out. Pesticide residues were detected in 19 of all analysed samples (9.3%). The residues of 3 insecticides: deltamethrin, malathion and pirimiphos-methyl and one fungicide – azoxystrobin were detected. The residues were detected mostly in wheat bran (46.1%), ground wheat (40.0%), barley (14.9%) and rye (12.5%). Any violations of MRLs were found in analysed samples. In 2010, unauthorized plant protection residue was found in one sample.
In 2004–2009, a total of 221 samples of soil, plant material, and organic food of plant origin from region of south-eastern Poland were analysed for residues of active substances of some plant protection products. Pesticide residues were found in 9 samples (4.1% of analysed samples) and those were: procymidone, bifenthrin, dithiocarbamates, fenithrotion and captan. In general, the obtained results indicate that Polish organic grower applies plant protection products recommended for organic production. Some violations indicate that such control should be carried on and broadened.
Background. Poland is a leading grower/producer of berries in Europe that are either eaten raw or processed. As well as berries this includes fruit such as grapes, strawberries and other small fruits. Testing for the presence of active substances in Plant Protection Products, (PPP), in such fruit is however important, as part of measures taken to minimise human intake. Objective. To determine the incidence of pesticide residues in berries harvested from South-Eastern Poland in 2009-2011. Material and methods. Chromatographic separation followed by analytical detection was performed on 250 samples of various test fruits using an accredited methodology: GC/ECD/NPD, together with spectrophotometric detection wherever necessary, according to PN-EN ISO/IEC 17025. As part of previous monitoring, 126 active substances were identified in 2009, 132 in 2010 and 153 in 2011; levels were compared to Maximum Residue Limits (MRLs). Results. Analyses showed that 46.4% of samples contained PPPs of which 4% exceeded the MRL. The most were found in raspberries, (58.8% of all tested), followed by 58.3% redcurrants, and gooseberries as well as 50% grapes. The most frequently found active substances of PPPs were pyrimethanil (15.6%), dithiocarbamates (12.4%), procymidone (8%), cyprodinil (5.6%) and difenoconazole (5.2%). The highest MRL exceedances were found in blackcurrants. Testing also revealed many examples of pesticides not recommended for the protection of specific crops: propiconazole in gooseberries, cyprodinil, flusilazole, iprodione, pyrimethanil in blackcurrants and folpet and captan in raspberries. Furthermore, active substances whose use in PPPs have been forbidden since 2008 were also detected, ie. endosulfan in blackcurrants and strawberries, fenitrothion in black and red currants as well as procymidone in raspberries, blackcurrants and strawberries. These data are consistent to those obtained from the whole of Poland and the European Union (EU). Conclusions. Most pesticides were present in raspberries, redcurrants, gooseberries and grapes of which fungicides were the most frequently detected. These results are in keeping with other similar studies.
In 2009 484 samples of fruit and vegetables from south-eastern Poland were surveyed. Pesticide residues were found in 150 (31%) of them, one substance in 99 samples and two or more in 51 samples. The most often were found: chlorpyrifos (8.9% samples) of insecticides and dithiocarbamates (7.2%), pyrimethanil (5.4%) and procymidone (4.8%) of fungicides. Violations of MRLs were found in 3.5% of analysed samples.
In 2011 samples of crops from south-eastern Poland were analysed. Pesticide residues were detected in 102 from 213 analysed samples. Among fungicide, residues mostly detected were: captan (22% samples), boscalid (12%), cyprodinil (5%) and difenoconazole (5%). Insecticide residues detected were: chlorpyrifos (8%), cypermethrin (4%) and pirimicarb (4%). Exceeding of MRLs were found in 4.2% of analysed samples.
Currant ranks second place in the world production of berries after strawberries. Currants are important primarily due to the content of vitamins, mineral salts, organic compounds and many micronutrients. The aim of this study was to assess the occurrence of pesticide residues in the currants analyzed in the Laboratory of Pesticide Residue Analysis in Rzeszow in 2009–2013. A total of 143 samples were tested using the gas chromatography technique (GC/ECD/NPD – gas chromatography with electron capture and nitrogen phosphorus detection) and spectrophotometric method for the determination of dithiocarbamates. The control programme included the detection of 130 active substances in 2009, 137 in 2010, 152 in 2011, 166 in 2012 and 187 active substances in 2013. The results were compared with the maximum residue limits (MRLs). 43% of samples tested contained pesticide residues, and exceeding of MRLs values was stated in 10 samples. The identified residues which exceeded MRLs were chlorpyrifos-methyl, cypermethrin, endosulfan, fenazaquin, flusilazole and procymidone. The fungicides were the most frequently detected in the all analysed samples. The most frequently detected substances were: dithiocarbamates (30 samples), cypermethrin (14 samples) and difenoconazole (12 samples).
The aim of study was to check the usefulness of the QuEChERS (Quick Easy Cheap Effective Rugged and Safe) method coupled with gas chromatography with electron capture detection and thermionic detection in analysis of pesticide residues in honey samples. 19 insecticides belonging to different chemical groups: organochlorine, organophosphates and pyrethroids were selected for the analysis. For 17 active substances satisfactory recovery, according to SANCO (DG SANCO – Directorate General for Health and Consumers) were received. For 2 substances: aldrin and HCB recovery did not fulfill the criteria of SANCO. The relative standard deviation (RSD), for all analyzed active substances were equal or lower than 20%.
The aim of the study was to evaluate the occurrence of pyrimidine fungicide residues in fruits and vegetables in 2012–2013. Validated analytical methods based on liquid / liquid extraction coupled with gas chromatography with electron capture and nitrogen phosphorus detection (GC-ECD/NPD – gas chromatography with electron capture and nitrogen phosphorus detection) were used for analysis. The total of 704 samples of fruits and vegetables were tested for the presence of pesticide residues, 49 of all samples had residues of pyrimidine fungicides. Cyprodinil and pyrimethanil were the most commonly found residues. In the analysed samples two cases of irregularity associated with the use of preparations of pyrimidine were found, the first was related with the use of nonrecommended plant protection product, the second was related with exceeding the maximum residue levels.
The aim of this study was to evaluate the usefulness of the QuEChERS (quick, easy, cheap, effective, rugged and safe) sample preparation technique in conjunction with gas chromatography with electron capture and nitrogen phosphorus detection (GC‐ECD/NPD – gas chromatography with electron capture and nitrogen phosphorus detection) for the analysis of pesticide residues in peppermint. Validation experiments were carried out for 14 compounds at two spiking levels of 0.01 and 0.1 mg/kg. The obtained results were highly satisfactory and compliant with the criteria recommended by the European Union document SANCO/10684/2009 (recently superseded by SANCO/12684/2011). The compounds showed recoveries in the range of 70–120% and repeatability (relative standard deviation) equal to or less then 20%. The QuEChERS allowed to obtain high quality pesticide residue results with a reduced number of analytical steps and a lower glassware and solvent consumption compared with used previously method.
Pierwsza strona wyników Pięć stron wyników wstecz Poprzednia strona wyników Strona / 2 Następna strona wyników Pięć stron wyników wprzód Ostatnia strona wyników
JavaScript jest wyłączony w Twojej przeglądarce internetowej. Włącz go, a następnie odśwież stronę, aby móc w pełni z niej korzystać.