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Food Qual Safet
    
Residue determination of β-cyfluthrin and imidacloprid as mix formulation in/on chickpea (Cicer arietinum) pods and soil and its risk assessment
Suchi Chawla, Paresh G. Shah, Anil R. Patel, Hemlatta K. Patel, Kiran M. Vaghela and Priti P. Solanki
Pesticide Residue Laboratory, AINP on Pesticide Residues, ICAR, Unit-9, Anand Agricultural University, Anand, Gujarat, India
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Abstract  

OBJECTIVES: A field experiment was conducted at Agricultural Research Station for irrigated crops at Thasara, Anand Agricultural University, Anand, to study the dissipation and risk assessment of β-cyfluthrin and imidacloprid as combination product in/on chickpea. 

MATERIALS AND METHODS: Solomon 300 OD comprising 9 per cent β-cyfluthrin and 21 per cent imidacloprid was foliar sprayed at the doses of 18 + 42g a.i. ha-1 (standard dose) and 36 + 84g a.i. ha-1 (double dose). Totally three sprays were made at an interval of 1 week starting from fruiting stage. 

RESULTS AND DISCUSSIONS: The residues of β-cyfluthrin estimated using gas chromatograph with electron capture detector (GC-ECD) showed an initial deposit of 0.16 and 0.27 μg g-1 in standard and double doses, respectively. The residues for corresponding doses persisted till 7th and 10th day after application and reached below determination level of 0.01μg g-1 on the 10th and 15th day, respectively. Imidacloprid was estimated using high performance liquid chromatography (HPLC) and showed initial deposits of 1.22 and 2.7 μg g-1 in standard and double doses, respectively. Its levels reached below the determination level (0.01 μg g-1) on the 15th day in green pods. Statistical analysis of dissipation kinetics showed that β-cyfluthrin followed zero-order kinetics in standard dose with half-life of 7.27 days. In double dose, the dissipation kinetics followed first-order kinetics with half-life of 9 days. Imidacloprid followed first-order kinetics in both the doses with half-life of 6.7 and 7.7 days. 

CONCLUSIONS: A pre-harvest interval (PHI) of 15 days is suggested. Theoretical risk assessment calculated as hazard quotient was less than 1, rendering the use of combination product as safe-provided proper PHI is followed.



Key wordschickpea      β-cyfluthrin      imidacloprid      dissipation      dissipation kinetics      residue      risk assessment      pods     
Published: 01 June 2018
Corresponding Authors: Suchi Chawla, Pesticide Residue Laboratory, AINP on Pesticide Residues, ICAR, Unit-9, Anand Agricultural University, Anand-388 110, Gujarat, India.     E-mail: suchisood10@yahoo.co.uk
Cite this article:

Suchi Chawla, Paresh G. Shah, Anil R.?Patel, Hemlatta K. Patel, Kiran M. Vaghela and Priti P. Solanki. Residue determination of β-cyfluthrin and imidacloprid as mix formulation in/on chickpea (Cicer arietinum) pods and soil and its risk assessment. Food Qual Safet, 2018, 2(2): 75-81.

URL:

http://www.zjujournals.com/fqs/10.1093/fqsafe/fyy007     OR     http://www.zjujournals.com/fqs/Y2018/V2/I2/75


β-氟氯氰菊酯和吡虫啉混合制剂在鹰嘴豆(Cicer arietinum)豆荚和土壤中的的残留及其风险评估

【目标】农业研究站在Anand、Anand农业大学、Thasara进行农田灌溉作物田间试验,研究β-氟氯氰菊酯和吡虫啉作为鹰嘴豆混合制剂的耗散和风险评估。

材料和方法】包含9%β-氟氯氰菊酯和21%吡虫啉的Solomon 300 OD以18±42g a.i. ha-1(标准剂量)和36±84g a.i. ha-1(双剂量)的剂量进行叶面喷雾。从结果期开始持续三次每隔1周进行喷雾。

【结果与讨论】使用带电子捕获检测器(GC-ECD)的气相色谱仪测定标准和双倍剂量β-氟氯氰菊酯残留物的沉积量分别为0.16和0.27μgg-1。相应剂量的残留物持续至第7天和第10天,并分别在第10天和第15天达到0.01μgg-1的测定水平。使用高效液相色谱法(HPLC)测定吡虫啉,并分别在标准和双剂量下显示沉积物为1.22和2.7μgg-1。绿色豆荚中第15天时其含量低于测定水平(0.01μgg-1)。耗散动力学的统计分析表明,β-氟氯氰菊酯在标准剂量下遵循零级动力学,半衰期为7.27天。在双倍剂量下,耗散动力学遵循一阶动力学,半衰期为9天。吡虫啉在两种剂量中都遵循一级动力学,半衰期为6.7和7.7天。

【结论】建议收获前间隔时间(PHI)为15天。根据危险商数计算的理论风险评估小于1,因此使用混合制剂作为安全提供的适当PHI。


关键词: 鹰嘴豆,  β-氟氯氰菊酯,  吡虫啉,  耗散动力学,  残留风险评估,  豆荚