Evaluation of fluoride ion residues in black tea after fumigation with sulfuryl fluoride

Year 2023, Volume: 63 Issue: 1, 14 - 18, 31.03.2023

Üzeyir Aktuğ , Yalçın Duydu

https://doi.org/10.16955/bitkorb.1241447

Abstract

Sulfuryl fluoride is a colorless, odorless gas used as a fumigant against pests during the storage of durable agricultural products. It is also one of the alternatives to methyl bromide, which is banned by the Montreal Protocol. During a fumigation, the decomposition product of sulfuryl fluoride residue can also be formed in addition to the sulfuryl fluoride residue. Fluoride is actually a natural ingredient of the tea plant. However, within the growing process of the tea plant fluoride is concentrated in the old leaves when compared with the young shoots. Investigating the variation of the fluoride content in black tea before and after sulfuryl fluoride fumigation is the subject of this study. Three different brands of black teas with different fluoride concentrations purchased from local supermarkets in 2022 were fumigated with approximately 60 g/m3 of sulfuryl fluoride for 24 hours in a 1 m3 fumigation chamber. The AOAC’s recommended method for extraction of fluoride in plants (Method 975.04) was applied in this study. It was compared with the fluoride contents after fumigation in teas (41.4; 165.1 and 329.5 mg/kg, respectively). It is concluded that there is no statistically [t(7)=0,284; t(7)=0,769 and t(7)=1,419 p>0,05] significant difference in fluoride content in teas after fumigation.

Keywords

fluoride, residue, black tea, sulfuryl fluoride, fumigation, ion selective electrode, adequate intake of fluoride

Thanks

Thanks to Assoc. Prof. Sait ERTÜRK for help with the fumigation of tea samples and Barcan Ilaçlama Fumigasyon Ticaret Ltd. Sti for providing the working material, sulfuryl fluoride (PROPESTGAS).

Siyah çayda sülfüril florit fumigasyonu sonrası florür iyonu kalıntısının değerlendirilmesi

Abstract

Sülfüril florit, tarım ürünlerinin depolanması sırasında zararlılara karşı fumigant olarak kullanılan renksiz, kokusuz bir gazdır. Ayrıca Montreal Protokolü ile yasaklanan Metil bromitin alternatiflerinden biridir. Fumigasyon sırasında gıdalarda Sülfüril florit kalıntısına ek olarak bozunma ürünü olan flor iyonu kalıntısı da oluşabilmektedir. Çayın doğal içeriğinde bulunan florür uzun zamandan beri bilinmektedir ve çay bitkisinin yetişme şartlarından dolayı genç sürgünlere göre yaşlı yapraklarda daha fazla bulunmaktadır. Sülfüril florit fümigasyonundan sonra siyah çaydaki florür içeriğindeki değişim bu çalışmanın konusunu oluşturmaktadır. 2022 yılında yerel süpermarketlerden satın alınan farklı florür konsantrasyonuna sahip üç farklı ticari markalı siyah çay örneği, 1 m3'lük fümigasyon odasında 24 saat boyunca yaklaşık 60 g/m3 Sülfüril florit ile fümigasyona tabi tutulmuştur. Bu çalışmada florür ekstraksiyonu için AOAC'ın bitkisel ürünlerde önerdiği yöntem (Metot 975.04) kullanılmıştır. Fumigasyon öncesinde sırasıyla 41.4; 165.1 ve 329.5 mg/kg olarak belirlenen florür içerikleri fumigasyon sonrası florür konsantrasyonları ile karşılaştırılmış ve istatistiksel olarak anlamlı bir fark olmadığı [t(7)=0.284; t(7)=0.769 ve t(7)=1.419 P>0.05] sonucuna varılmıştır.

Keywords

florür, kalıntı, siyah çay, sülfüril florit, fumigasyon, iyon seçici elektrot, yeterli florür alımı

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