The standard states that the citric acid-sodium nitrate treatment is the least hazardous for removal of free iron and other metallic contamination and light surface contamination.
该标准声明：柠檬酸-硝酸钠处理在去除游离铁合其他金属污染和轻的表面污染物时，危险性最低。
The results indicated that nitrate pollution of vegetables in Guangdong was serious, and that of leafy vegetables in particular, was higher than related hygienic standard.
结果表明，广东省蔬菜生产基地的蔬菜硝酸盐含量超标严重，特别是市民食用量较大的几种叶类蔬菜超标最为明显。
There is national standard, trade standard and local standard in China, which include the maximum limit of harmful metal, nonmetal elements, nitrate, nitrite and pesticide residues.
我国蔬菜产品安全质量标准有国家标准、行业标准及地方标准几大类，标准内容包括有害金属、非金属元素、硝酸盐和亚硝酸盐及农药残留的最大限量值。
Objective: nitrate automatic reduction device has been studied according to national standard method, and this device is used to detect nitrate in vegetables.
目的：根据国标方法研制硝酸盐自动还原装置，并用于蔬菜中硝酸盐的测定。
Objective: nitrate automatic reduction device has been studied according to national standard method, and this device is used to detect nitrate in vegetables.
目的：根据国标方法研制硝酸盐自动还原装置，并用于蔬菜中硝酸盐的测定。
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