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Total phosphorus determination in eutrophic tropical river sediments by laser-induced breakdown spectroscopy techniques
Analytical Methods ( IF 2.7 ) Pub Date : 2020-12-10 , DOI: 10.1039/d0ay02008g Carla Pereira de Morais 1, 2, 3, 3, 4 , Gustavo Nicolodelli 3, 5, 6, 7 , Milene Corso Mitsuyuki 3, 4 , Kleydson Stênio Gaioso da Silva 3, 4 , Frederico Fábio Mauad 2, 3, 8 , Stéphane Mounier 9, 10, 11, 12, 13 , Débora Marcondes Bastos Pereira Milori 3, 4
Analytical Methods ( IF 2.7 ) Pub Date : 2020-12-10 , DOI: 10.1039/d0ay02008g Carla Pereira de Morais 1, 2, 3, 3, 4 , Gustavo Nicolodelli 3, 5, 6, 7 , Milene Corso Mitsuyuki 3, 4 , Kleydson Stênio Gaioso da Silva 3, 4 , Frederico Fábio Mauad 2, 3, 8 , Stéphane Mounier 9, 10, 11, 12, 13 , Débora Marcondes Bastos Pereira Milori 3, 4
Affiliation
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Total phosphorus (TP) in sediments is an important chemical variable in the study of the extent of eutrophication in water bodies. Two methods, based on single pulse (SP) and double pulse (DP) laser-induced breakdown spectroscopy (LIBS), were developed for determining TP in the sediment cores of Brazilian rivers upstream from the Barra Bonita reservoir. TP concentration in the sediments was determined by inductively coupled plasma optical emission spectrometry (ICP OES) on digested samples. Besides, a LIBS system operating in SP and DP modes was used to develop methods for TP quantification in sediment pellets. In LIBS, the most appropriate wavelength to measure P was 214.91 nm. The calibration curves showed correlation coefficients of 0.93 and 0.92 and limits of detection of 709 mg kg−1 and 349 mg kg−1 for SP and DP LIBS, respectively. The two proposed methods were validated and the average percentage errors were 14% and 10% for SP and DP LIBS, respectively. The ICP OES and SP and DP LIBS data showed that the most superficial layers of the Piracicaba River, all the sedimentary layers of the Tietê River, and the confluence region present a high concentration of TP, according to the Brazilian sediment quality criterion. In conclusion, SP and DP LIBS were confirmed as promising alternative tools to traditional analytical methods for monitoring the TP content in the sediments that come from different hydrographic units. The proposed method using DP LIBS proved more sensitive than SP LIBS, but the SP LIBS method demonstrated enough precision for determining TP in eutrophic river sediments.
中文翻译：
激光诱导击穿光谱技术测定富营养化热带河流沉积物中的总磷
沉积物中的总磷（TP）是研究水体富营养化程度的重要化学变量。开发了两种基于单脉冲（SP）和双脉冲（DP）激光诱导击穿光谱法（LIBS）的方法，用于测定巴拉博尼塔水库上游巴西河流的沉积岩心中的总磷。沉积物中的TP浓度通过电感耦合等离子体发射光谱法（ICP OES）测定消化后的样品。此外，使用在SP和DP模式下运行的LIBS系统开发了沉淀物颗粒中TP定量的方法。在LIBS中，最适合测量P的波长是214.91 nm。校正曲线的相关系数为0.93和0.92，检出限为709 mg kg -1和349 mg kg-1分别用于SP和DP LIBS。验证了所提出的两种方法，SP和DP LIBS的平均百分比误差分别为14％和10％。ICP OES和SP以及DP LIBS数据显示，根据巴西的沉积物质量标准，Piracicaba河的最浅层，Tietê河的所有沉积层以及汇合区域均呈现高浓度的TP。总之，SP和DP LIBS被确认为监测来自不同水文单位的沉积物中TP含量的传统分析方法的有前途的替代工具。所提出的使用DP LIBS的方法被证明比SP LIBS更灵敏，但是SP LIBS方法显示出足够的精度来确定富营养化河流沉积物中的TP。
更新日期：2020-12-21
中文翻译：
激光诱导击穿光谱技术测定富营养化热带河流沉积物中的总磷
沉积物中的总磷（TP）是研究水体富营养化程度的重要化学变量。开发了两种基于单脉冲（SP）和双脉冲（DP）激光诱导击穿光谱法（LIBS）的方法，用于测定巴拉博尼塔水库上游巴西河流的沉积岩心中的总磷。沉积物中的TP浓度通过电感耦合等离子体发射光谱法（ICP OES）测定消化后的样品。此外，使用在SP和DP模式下运行的LIBS系统开发了沉淀物颗粒中TP定量的方法。在LIBS中，最适合测量P的波长是214.91 nm。校正曲线的相关系数为0.93和0.92，检出限为709 mg kg -1和349 mg kg-1分别用于SP和DP LIBS。验证了所提出的两种方法，SP和DP LIBS的平均百分比误差分别为14％和10％。ICP OES和SP以及DP LIBS数据显示，根据巴西的沉积物质量标准，Piracicaba河的最浅层，Tietê河的所有沉积层以及汇合区域均呈现高浓度的TP。总之，SP和DP LIBS被确认为监测来自不同水文单位的沉积物中TP含量的传统分析方法的有前途的替代工具。所提出的使用DP LIBS的方法被证明比SP LIBS更灵敏，但是SP LIBS方法显示出足够的精度来确定富营养化河流沉积物中的TP。
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