Ulusal sertifikalı referans malzeme pestisit karışımının hazırlanması: Üretim için fizibilite çalışmaları

Feasibility studies were carried out with the aim of preparing a national reference pesticide mixture. Two main mixtures (mixture 1 and mixture 2) were prepared using a total of 108 pesticides, mixture 1 contains 24 pesticides, while mixture 2 contains 84 pesticides, mixtures were prepared twice using by gravi-metric method (mix A and mix B) and once using by volumetric method (mix C), HCB, metolachlor, α-HCH, γ-HCH, aldrin, dieldrin, endrin, 4,4'-DDD, 4,4'-DDT, 2,4'-DDT, α-endosulfan, β-endosulfan, heptachlor and heptachlor endo-epoxide were analysed in gravimetric mixtures, and except for HCB, metolachlor, heptachlor endo-epoxide, the same pesticides were analysed in vol-umetric mixtures. Short- and long-term stability tests of organochlorine pesti-cides were undertaken at 20°C to determine transport behaviour, and at +4°C and -20°C to determine behaviour under optimal storage conditions. The most stable temperature was considered as -20°C. There is no significant change in the con-centration of the pesticides determined weekly and monthly in the mixtures over a period of 5 months. The uncertainty of these pesticides was calculated with respect to the uncertainty of homogeneity, short- and long-term stability, purity of standards, GC-MS calibration plot and uncertainty of characterization accord-ing to ISO Guide 17034. Consequently, the expanded uncertainty results for HCB, metolachlor, α-HCH, γ-HCH, aldrin, dieldrin, endrin, 4,4'-DDD, 4,4'-DDT, 2,4'-DDT, α-endosulfan, β-endosulfan, heptachlor and heptachlor endo-epoxide were determined around 0.5, 0.7, 0.5, 0.5, 0.3, 0.2, 0.4, 0.6, 0.8, 0.7, 0.3, 0.3, 1.2 and 0.5 in gravimetric mixtures for 100 ppm. In volumetric mixture, their expanded uncertainties were determined to be 2.4, 3.1, 4.1, 2.7, 15. 2.8, 4.1, 3.9, 3.2, 3.6 and 12.6 for 80 ppm, respectively.