CAJ | 학술논문

以提高激光诱导击穿光谱（LIBS）技术精准检测水体中的重金属元素 Cr 为研究目的，对实验室配制的7种不同质量浓度的含铬（Cr）水溶液采用护肤棉进行富集，并对自然晾干后的护肤棉进行 LIBS 试验。首先对试验参数进行了优化并确定425.43 nm 为 Cr 的特征分析谱线。选择护肤棉中固有的钙（Ca）元素作为内定标元素，其特征谱线为422.67 nm。分别采用内定标法和直接定标法进行定量分析，取其中的五个样品建立定量分析模型，并利用另外的两个样品验证模型的准确性，得出拟合曲线的线性相关系数分别为0.99614、0.73655，两个验证样品的相对误差值分别为11.38％、4.84％和64.66％、11.58％；内定标法 LIBS 的检出限为5.27μg／mL，优于之前滤纸富集的6.06μg／mL。试验结果表明以护肤棉为吸附基质结合内定标法能提高 LIBS 检测水体 Cr 元素的准确性、并能降低检出限。
이제고격광유도격천광보（LIBS）기술정준검측수체중적중금속원소 Cr 위연구목적，대실험실배제적7충불동질량농도적함락（Cr）수용액채용호부면진행부집，병대자연량간후적호부면진행 LIBS 시험。수선대시험삼수진행료우화병학정425.43 nm 위 Cr 적특정분석보선。선택호부면중고유적개（Ca）원소작위내정표원소，기특정보선위422.67 nm。분별채용내정표법화직접정표법진행정량분석，취기중적오개양품건립정량분석모형，병이용령외적량개양품험증모형적준학성，득출의합곡선적선성상관계수분별위0.99614、0.73655，량개험증양품적상대오차치분별위11.38％、4.84％화64.66％、11.58％；내정표법 LIBS 적검출한위5.27μg／mL，우우지전려지부집적6.06μg／mL。시험결과표명이호부면위흡부기질결합내정표법능제고 LIBS 검측수체 Cr 원소적준학성、병능강저검출한。
In order to improve detection accuracy of heavy metal Cr in water by the laser induced breakdown spectros-copy (LIBS),7 kinds of different concentrations of chromium (Cr)water solution were prepared and enriched by the skin cotton,and then the cotton after drying was detected by LIBS.The experimental parameters were optimized,and 425.43 nm was determined as the Cr feature analysis spectral line.The natural calcium (Ca)element in the skin care cotton was chosen as internal calibration element,its feature spectral line is 422.67 nm.Internal calibration method and calibration method were used for quantitative analysis,and the quantitative analysis model was established for five samples,and then the another two samples were used to verify the accuracy of the model.The obtained linear correlation coefficients of the fitting curve are 0.9961 4 and 0.73655 respectively,and the relative errors of two valida-ted samples are 1 1 .38%,4.84% and 64.66%,1 1 .58%;LIBS detection limit is 5.27μg/mL by internal calibration method,and it is better than detection limit 6.06 μg/mL by filter paper enrichment.Experimental results show that the skin cotton as adsorption matrix combined with internal calibration method can improve the accuracy of LIBS in detecting Cr elements in water,and can reduce the detection limit.