灌溉水中离子及Pb^(2+)对辣椒中Pb含量的影响

Effects of Anion and Pb^(2+)in Irrigation Water on Pb Content in Pepper

以Cl^(-)、SO_(4)^(2-)、HCO_(3)^(-)、NO_(3)^(-)和Pb^(2+)等盐分离子为试材,采用盆栽正交实验法,研究了灌溉水中的盐分离子对辣椒中Pb含量的影响,以期为乌鲁木齐市辣椒种植提供参考依据。结果表明:辣椒果实中Pb含量为ND(未检出)~0.040 mg·kg^(-1)(干质量),若以鲜质量计,辣椒果实中Pb含量为ND~0.007 mg·kg^(-1),未超过《食品安全国家标准-食品中污染物限量》(GB 2762-2017)中的限值(0.1 mg·kg^(-1));灌溉水中的Cl^(-)对辣椒根、茎中Pb含量的影响最大,其与根中Pb含量呈正相关接近于显著水平,与茎中Pb含量呈显著负相关;SO_(4)^(2-)与茎中Pb含量呈负相关接近于显著水平;乌鲁木齐市灌溉水中的阴离子对辣椒Pb含量的累积影响较小。

Taking Cl^(-),SO_(4)^(2-),HCO_(3)^(-),NO_(3)^(-),and Pb^(2+)ions as the experimental materials,the orthogonal experimental method was employed in potted plants to investigate the influence of salt ions in irrigation water on the Pb content in peppers,in order to provide reference for pepper cultivation in Urumqi.The results showed that,the Pb content in pepper fruits ranged from ND(not detected)to 0.040 mg·kg^(-1)(dry weight),and from ND to 0.007 mg·kg^(-1) if calculated by fresh weight.It did not exceed the limit value(0.1 mg·kg^(-1))in National Standards for Food Safety-Limits of Contaminants in Food(GB 2762-2017);Cl^(-)in irrigation water had the greatest effect on Pb content in root and stem of pepper,which was positively correlated with Pb content in root and close to a significant level,and negatively correlated with Pb content in stem.The negative correlation between SO_(4)^(2-) and Pb content in stem was close to a significant level.The cumulative effect of anions in irrigation water on Pb content of pepper in Urumqi city was small.