CAJ | 학술논문

为选择用锌-镉还原法测定天然水中硝酸盐的适宜条件,对基质盐度、盐分组成、锌片面积、锌卷形状、容器器形、 pH等6个影响因素,以及盐分组成与pH和锌片面积与锌卷形状因素间的交互作用进行了研究,并按照L16(41×212)正交表进行正交试验。结果表明：6个因素对测定结果的影响大小依次为基质盐度>盐分组成>锌片面积>pH>容器器形>锌卷形状,其中基质盐度、盐分组成和锌片面积对测定结果影响显著(P<0.05)；用锌-镉还原法测定天然水中硝酸盐的最优测定条件为震荡频率210 r/min,还原时间12 min,基质盐度25,在每升试验水中加入0.196 g NaHCO3,锌片面积为5 cm×6 cm,在此优化条件下进行测定,可得到较高且稳定的还原率,其精密度和回收率均较好。
위선택용자-력환원법측정천연수중초산염적괄의조건,대기질염도、염분조성、자편면적、자권형상、용기기형、 pH등6개영향인소,이급염분조성여pH화자편면적여자권형상인소간적교호작용진행료연구,병안조L16(41×212)정교표진행정교시험。결과표명：6개인소대측정결과적영향대소의차위기질염도>염분조성>자편면적>pH>용기기형>자권형상,기중기질염도、염분조성화자편면적대측정결과영향현저(P<0.05)；용자-력환원법측정천연수중초산염적최우측정조건위진탕빈솔210 r/min,환원시간12 min,기질염도25,재매승시험수중가입0.196 g NaHCO3,자편면적위5 cm×6 cm,재차우화조건하진행측정,가득도교고차은정적환원솔,기정밀도화회수솔균교호。
Effects of six primary factors including matrix salinity, salt composition, zinc sheet area, zinc volume, shape of container and pH on of detection of nitrate in natural water by zinc cadmium reduction method were studied to optimize the detection conditions, and the interactions between salt composition and pH, as well as zinc sheet ar-ea and zinc volume were investigated by orthogonal L16(41 × 212) test. The results showed that the order of the effect levels of these factors were successively ranged as matrix salinity >salt composition >zinc sheet area >pH >container shape >zinc volume shape, significant differences by matrix salinity, salt composition and zinc sheet are-a. The optimal nitrate determination in natural water by zinc - cadmium method was observed under conditions of oscillation frequency 210 r/min, 12 minute reduction, salinity 25, NaHCO3 0. 196 g/L and zinc sheet size of 5 cm×6 cm. Under the above conditions, a higher and more stable reduction rate with better method's precision and recovery efficiency could be obtained.