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Real-time determination of volatile organic compounds (VOCs) by ion molecule reaction – mass spectrometry (IMR-MS) 离子分子反应-质谱法实时测定挥发性有机化合物
IF 1.6 4区 工程技术 Q4 CHEMISTRY, ANALYTICAL Pub Date : 2022-09-19 DOI: 10.1080/10739149.2022.2123817
H. Chu, Kyoung-Soon Jang, Byung-Hee Choi, Jae Wook Kang, Chae Eun Son, Y. Ahn
Abstract Comprehensive analytical validation studies of a developed ion molecule reaction – mass spectrometer (IMR-MS) were undertaken for the real-time determination of volatile organic compounds (VOCs) in air. The instrument was developed with a focus on promoting chemical ionization (CI) in the reaction chamber by direct sample loading and enhancing maintenance efficiency and reliability of the results. Instrument stability was assessed through a system check and pre-performance check process, and consequently, the instrumental and analytical conditions including the plasma generation, pressure, temperature, and flow rate were successfully optimized. Relevant performance characteristics, such as mass resolution, mass detection range, accuracy, and precision were also investigated by VOC standards composed of benzene, toluene, perfluorotoluene, propylbenzene, and octane. To evaluate whether the performance of the technology is comparable to already accepted techniques, the quantitative results of the IMR-MS were compared with those of a commercial mass spectrometer. This evaluation was successful and suggests the applicability of the technology for spillage accidents of hazardous chemicals and identification of odor-causing substances as well as for real-time gas analysis.
摘要对开发的离子分子反应-质谱仪(IMR-MS)进行了全面的分析验证研究,用于实时测定空气中的挥发性有机化合物(VOCs)。该仪器的开发重点是通过直接加载样品来促进反应室中的化学电离(CI),并提高维护效率和结果的可靠性。通过系统检查和性能前检查过程评估了仪器的稳定性,因此,成功地优化了仪器和分析条件,包括等离子体产生、压力、温度和流速。通过由苯、甲苯、全氟甲苯、丙苯和辛烷组成的VOC标准,研究了相关性能特征,如质量分辨率、质量检测范围、准确度和精密度。为了评估该技术的性能是否与已经接受的技术相当,将IMR-MS的定量结果与商业质谱仪的定量结果进行了比较。该评估是成功的,表明该技术适用于危险化学品泄漏事故、气味物质识别以及实时气体分析。
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引用次数: 0
Low-cost 3D-printing system for the deposition of reduced graphene oxide (rGO) thin films by dip-coating with application for electrode fabrication 低成本3D打印系统,用于通过浸涂沉积还原氧化石墨烯(rGO)薄膜,并应用于电极制造
IF 1.6 4区 工程技术 Q4 CHEMISTRY, ANALYTICAL Pub Date : 2022-09-15 DOI: 10.1080/10739149.2022.2122996
R. Challhua, A. Champi
Abstract A low-cost 3D-printing system is reported for the deposition of thin films by a dip-coating technique. The structure was constructed using 3D-printed pieces of polylactic acid (PLA) joined by simple snap-fit. This structure assembly and design simplifies the construction and replicability of dip-coating equipment. The components used are affordable and accessible, reducing the cost of implementation. An Arduino controls the system through a C++ program that varies the pulling and dipping speed from 0.5 to 20 mm/s. The pulling and dipping process uses a servomotor motion transformed into linear by a rack and pinion mechanism. The performance of the presented system was validated by comparison of thin-film reduced graphene oxide (rGO) deposition onto gold. The rGO thin films obtained were homogeneous and smooth, capable of being used as electrodes in biosensors.
摘要报道了一种低成本的3D打印系统,用于通过浸涂技术沉积薄膜。该结构使用3D打印的聚乳酸(PLA)片通过简单的卡扣配合连接而成。这种结构组装和设计简化了浸涂设备的结构和可复制性。所使用的组件价格合理且易于使用,从而降低了实施成本。Arduino通过C++程序控制系统,该程序将拉伸和浸渍速度从0.5变为20 mm/s。拉伸和浸渍过程使用伺服电机运动,该运动通过齿条和小齿轮机构转换为线性。通过比较薄膜还原氧化石墨烯(rGO)在金上的沉积,验证了所提出的系统的性能。所获得的rGO薄膜均匀光滑,能够用作生物传感器中的电极。
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引用次数: 0
Characterization of the temperature distribution of a polymer permanent magnet synchronous motor with a fiber Bragg grating (FBG) 具有光纤布拉格光栅(FBG)的聚合物永磁同步电机的温度分布特性
IF 1.6 4区 工程技术 Q4 CHEMISTRY, ANALYTICAL Pub Date : 2022-09-15 DOI: 10.1080/10739149.2022.2123343
Wenyin Li, Jinghua Hu, Dong Wang
Abstract This article reports a distributed thermal monitoring approach for permanent magnet synchronous motors (PMSMs). The detecting system is based on using an electrically non-conductive and electromagnetic interference-free fiber Bragg grating (FBG) temperature sensor embedded in the stator of PMSMs. FBG thermal sensors with different annealing temperature were fabricated and integrated with a motor stator, and their accuracy for temperature measurement was evaluated. According to the experimental results, the error within 200 °C is limited between −6 °C and 2 °C when the annealing temperature is 95 °C, and the error decreases to ±1 °C when the annealing temperature is 120 °C, indicating that performance of FBG thermal sensor is improved by increasing the annealing temperature. This article provides methodogical guidance for improving the accuracy of stator temperature distribution measurements based on the FBG thermal sensor.
摘要本文报道了一种永磁同步电动机(PMSM)的分布式热监测方法。该检测系统是基于使用嵌入PMSM定子中的不导电且无电磁干扰的光纤布拉格光栅(FBG)温度传感器。制作了不同退火温度的FBG热传感器,并将其与电机定子集成,对其温度测量精度进行了评估。根据实验结果,误差在200以内 °C限制在−6之间 °C和2 退火温度为95℃时 °C,误差降至±1 退火温度为120℃时 °C,表明提高退火温度可以提高FBG热传感器的性能。本文为提高基于FBG热传感器的定子温度分布测量精度提供了方法指导。
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引用次数: 0
Preparation of a metal organic framework (MOF)-based monolithic column for the solid-phase extraction (SPE) of diosmetin from traditional Chinese medicine with determination by high-performance liquid chromatography (HPLC) 金属有机骨架(MOF)整体柱的制备及高效液相色谱法测定中药中薯蓣皂苷的固相萃取
IF 1.6 4区 工程技术 Q4 CHEMISTRY, ANALYTICAL Pub Date : 2022-09-13 DOI: 10.1080/10739149.2022.2120894
Sha Wang, Yamei Han, Jing Chen, Ligai Bai, Hongyuan Yan, Haiyan Liu
Abstract A metal organic framework (MOF)-based monolithic column was prepared by in situ polymerization using modified MIL-101-NH2 and glycidyl methacrylate (GMA) as monomers. The monolithic column was used as a solid phase extraction (SPE) adsorbent for on-line enrichment and preliminary purification of diosmetin in traditional Chinese medicine. After being characterized by scanning electron microscopy (SEM) and nitrogen adsorption-desorption, the advantages of the monolithic column with MIL-101-NH2 added were reflected in the pore structure and specific surface area. The monolithic column for SPE had a linear relationship from 0.13 µg/mL to 5.0 × 102 µg/mL. The limit of detection (LOD) and the limit of quantification (LOQ) were 0.04 µg/mL and 0.13 µg/mL, respectively. The recovery was from 96% to 104%, and the intra-day and inter-day relative standard deviations (RSDs) were below 1.1%. This method was suitable for the determination of diosmetin in complex samples.
摘要以改性MIL-101-NH2和甲基丙烯酸缩水甘油酯(GMA)为单体,采用原位聚合法制备了金属有机骨架(MOF)整体柱。采用整体柱作为固相萃取(SPE)吸附剂对中药薯蓣皂苷进行在线富集和初步纯化。通过扫描电镜(SEM)和氮气吸附-解吸等手段对其进行表征,发现添加MIL-101-NH2的整体柱的优势体现在孔结构和比表面积上。固相萃取整体柱在0.13µg/mL ~ 5.0 × 102µg/mL范围内呈线性关系。检测限(LOD)为0.04µg/mL,定量限(LOQ)为0.13µg/mL。回收率为96% ~ 104%,日内、日间相对标准偏差(rsd)均在1.1%以下。该方法适用于复杂样品中薯蓣皂苷的测定。
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引用次数: 0
Characterization of the chemical shift and asymmetry indices of praseodium, neodymium, samarium, gadolinium, and terbium compounds by wavelength dispersive X-ray fluorescence (WDXRF) 用波长色散X射线荧光(WDXRF)表征镨、钕、钐、钆和铽化合物的化学位移和不对称指数
IF 1.6 4区 工程技术 Q4 CHEMISTRY, ANALYTICAL Pub Date : 2022-08-27 DOI: 10.1080/10739149.2022.2115511
S. Durdağı, F. Güzel
Abstract Emitted X-ray energies, line shapes, fluorescence yields, absorption probabilities and absorption edges of the elements are X-ray fundamental parameters that are of practical significance because they facilitate compositional analysis of complex materials. They are also a potent test of atomic theory. The chemical effects may cause changes in the energy of the X-ray lines and line shapes, such as the full width at half maximum and asymmetry index values depending on the chemical state of the substance. Although these effects vary for each element, the causes of these differences have been investigated. In this study, changes in chemical action values of lanthanide group compounds were investigated using a single crystal wavelength dispersive X-ray spectrometer equipped with a rhodium anode X-ray tube. The Ll and Lη X-ray emission lines are characterized by fitting of the Lorentz function. The chemical shift was investigated according to the chemical bond type, molecular structure, and oxidation number.
发射的x射线能量、线形、荧光产额、吸收概率和元素的吸收边缘是x射线的基本参数,对复杂材料的成分分析具有重要的实际意义。它们也是对原子理论的有力检验。化学效应可能导致x射线线的能量和线形的变化,如半最大值时的全宽度和不对称指数值,这取决于物质的化学状态。尽管每种元素的影响各不相同,但人们已经研究了造成这些差异的原因。本研究采用单晶波长色散x射线光谱仪,配以铑阳极x射线管,研究了镧系化合物化学作用值的变化。用洛伦兹函数拟合来表征l和Lη x射线发射谱线。根据化学键类型、分子结构和氧化数考察了其化学位移。
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引用次数: 1
Monitoring relative humidity using a Mach-Zehnder interferometer (MZI) senor based upon a photonic crystal fiber (PCF) coated with polyvinyl alcohol (PVA) 使用基于涂有聚乙烯醇(PVA)的光子晶体光纤(PCF)的马赫-曾德尔干涉仪(MZI)传感器监测相对湿度
IF 1.6 4区 工程技术 Q4 CHEMISTRY, ANALYTICAL Pub Date : 2022-08-24 DOI: 10.1080/10739149.2022.2115061
P. Gao, Xiaolin Zheng, Y. Liu, Zi-Xuan Wang
Abstract A relative humidity (RH) sensor is reported based upon a photonic crystal fiber (PCF) – Mach-Zehnder interferometer (MZI) with a polyvinyl alcohol (PVA) coating. The structure for sensing was prepared by fusing photonic crystal fiber to two single-mode fibers (SMFs) and completely collapsing the air holes of photonic crystal fiber in the fusion area to act as the beam splitter and coupler. By a lifting method, two to four layers of polyvinyl alcohol films were coated upon the photonic crystal fiber to characterize the influence of its thickness upon the sensitivity of the device for relative humidity. The experimental results show that the maximum sensitivity of this relative humidity sensor is 51.9 pm/% when the photonic crystal fiber surface is coated with three layers of polyvinyl alcohol film.
摘要报道了一种基于聚乙烯醇(PVA)涂层光子晶体光纤(PCF) -马赫-曾德干涉仪(MZI)的相对湿度传感器。通过将光子晶体光纤与两根单模光纤(smf)融合,并将融合区内光子晶体光纤的气孔完全折叠,作为分束器和耦合器,制备了传感结构。通过提升法,在光子晶体光纤上涂覆两到四层聚乙烯醇薄膜,表征其厚度对器件相对湿度灵敏度的影响。实验结果表明,在光子晶体光纤表面涂覆三层聚乙烯醇薄膜时,该相对湿度传感器的最大灵敏度为51.9 pm/%。
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引用次数: 1
Dual determination of strain and temperature using cascaded fiber Fabry–Perot interferometers with wavelength and phase demodulation 用波长和相位解调的级联光纤法布里-珀罗干涉仪对应变和温度的双重测定
IF 1.6 4区 工程技术 Q4 CHEMISTRY, ANALYTICAL Pub Date : 2022-08-18 DOI: 10.1080/10739149.2022.2111575
Yang Yu, Yuan-xin Li, Feng Xia, Bo Liu
Abstract A strain and temperature dual-parameter measurement device using cascaded optical fiber Fabry–Perot interferometers (FPIs) is reported in which both wavelength demodulation and phase demodulation are employed with the the parameters. A single-mode fiber (SMF), a short length of hollow-core fiber (HCF), a short section of SMF, and an HCF are spliced together to form the cascaded FPIs. In this structure, two dominant interference cavities are formed and two FPIs are generated, which are an air-cavity FPI and an air-silica cavity FPI. The sensitivities of the air-cavity FPI and the air-silica cavity FPI to strain or temperature are different, allowing the measurement of both parameters. In terms of wavelength demodulation, the temperature sensitivity of the air-cavity FPI (designated as FPI1) is 1.39 pm/°C and that of the air-silica cavity (designated as FPI2) is 8.56 pm/°C from 25 to 85 °C. In the strain range from 0 to 800 με, the strain sensitivity of FPI1 is 0.5 pm/με and that of FPI2 is 1.13 pm/με. Based on the sensitivity difference of the two FPIs, fixing the sensitivity matrix allows for simultaneous strain and temperature measurements. In addition, the dual parameters may also be measured by tracking the phase variations corresponding to the two FPIs. The reported sensor offers a simple splicing process, easy manufacture, low cost, and stable performance and provides a reference for dual-parameter dynamic measurements.
摘要报道了一种采用级联光纤法布里-珀罗干涉仪(FPI)的应变和温度双参数测量装置,该装置采用带参数的波长解调和相位解调。单模光纤(SMF)、短长度的空心光纤(HCF)、一小段SMF和一根HCF拼接在一起,形成级联的FPI。在这种结构中,形成了两个主要干涉腔,并产生了两个FPI,它们是空气腔FPI和空气二氧化硅腔FPI。空气腔FPI和空气-二氧化硅腔FPI对应变或温度的敏感性不同,允许测量这两个参数。在波长解调方面,空气腔FPI(指定为FPI1)的温度灵敏度为1.39 pm/°C,空气二氧化硅空腔(指定为FPI2)的温度为8.56 25至85的pm/°C °C。在0至800με的应变范围内,FPI1的应变灵敏度为0.5 με,FPI2为1.13 pm/με。基于两个FPI的灵敏度差异,固定灵敏度矩阵可以同时测量应变和温度。此外,还可以通过跟踪与两个FPI相对应的相位变化来测量双参数。所报道的传感器具有简单的拼接工艺、易于制造、低成本和稳定的性能,为双参数动态测量提供了参考。
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引用次数: 1
Modified D-type surface plasmon resonance (SPR)-based photonic crystal fiber (PCF) for application as a polarization filter and refractive index sensor 基于改性d型表面等离子体共振(SPR)的光子晶体光纤(PCF)用作偏振滤光器和折射率传感器
IF 1.6 4区 工程技术 Q4 CHEMISTRY, ANALYTICAL Pub Date : 2022-08-10 DOI: 10.1080/10739149.2022.2109161
Dan Yang, Yijin Li, Bin Xu, Zhulin Wei, T. Cheng, Xu Wang
Abstract A surface-modified D-type photonic crystal fiber (PCF) based on surface plasmon resonance (SPR) is reported for application as a polarization filter and refractive index sensor. The gold film is deposited on the surface of the designed fiber structure to stimulate the SPR effect. Through etching, the upper surface of the designed structure forms an angle of 170°. The etching angle changes the distance between the fiber core and the surface of gold film to enhance the local field SPR effect. The designed optical device is numerically simulated using the finite element method (FEM), the mode distribution is studied, and the coupling phenomenon is analyzed. At a wavelength of 1.31 µm, the y-polarization loss is 1307.90 dB/cm, while the loss of x-polarization is 1.13 dB/cm; at 1.55 µm, the y-polarization loss is 1755.19 dB/cm, while the x-polarization loss is only 1.24 dB/cm. In the case of the same structure parameters as the proposed polarization filter, of which communication window is 1.55 µm, the designed structure also serves as a refractive index sensor from 1.330 to 1.365. The average sensitivity of the refractive index sensor is up to 4857 nm/RIU, and the highest sensitivity is 7588 nm/RIU when the refractive index is 1.365. The results show that the reported SPR-based PCF simultaneously implements dual communication window polarization filtering and refractive index sensing. Hence, the designed device has promising applications with good filtering and sensing performance.
摘要报道了一种基于表面等离子体共振(SPR)的表面改性d型光子晶体光纤(PCF),用于偏振滤波和折射率传感器。在设计的纤维结构表面沉积金膜以激发SPR效应。通过刻蚀,所设计结构的上表面形成170°的夹角。蚀刻角度改变了光纤芯与金膜表面之间的距离,增强了局部场SPR效应。采用有限元法对所设计的光学器件进行了数值模拟,研究了其模态分布,并对耦合现象进行了分析。波长为1.31µm时,y极化损耗为1307.90 dB/cm, x极化损耗为1.13 dB/cm;在1.55µm处,y极化损耗为1755.19 dB/cm,而x极化损耗仅为1.24 dB/cm。在通信窗口为1.55µm的偏振滤波器结构参数相同的情况下,设计的结构还可以作为1.330 ~ 1.365范围内的折射率传感器。折射率传感器的平均灵敏度可达4857 nm/RIU,当折射率为1.365时,灵敏度最高为7588 nm/RIU。结果表明,基于spr的PCF同时实现了双通信窗口偏振滤波和折射率传感。因此,所设计的器件具有良好的滤波和传感性能,具有广阔的应用前景。
{"title":"Modified D-type surface plasmon resonance (SPR)-based photonic crystal fiber (PCF) for application as a polarization filter and refractive index sensor","authors":"Dan Yang, Yijin Li, Bin Xu, Zhulin Wei, T. Cheng, Xu Wang","doi":"10.1080/10739149.2022.2109161","DOIUrl":"https://doi.org/10.1080/10739149.2022.2109161","url":null,"abstract":"Abstract A surface-modified D-type photonic crystal fiber (PCF) based on surface plasmon resonance (SPR) is reported for application as a polarization filter and refractive index sensor. The gold film is deposited on the surface of the designed fiber structure to stimulate the SPR effect. Through etching, the upper surface of the designed structure forms an angle of 170°. The etching angle changes the distance between the fiber core and the surface of gold film to enhance the local field SPR effect. The designed optical device is numerically simulated using the finite element method (FEM), the mode distribution is studied, and the coupling phenomenon is analyzed. At a wavelength of 1.31 µm, the y-polarization loss is 1307.90 dB/cm, while the loss of x-polarization is 1.13 dB/cm; at 1.55 µm, the y-polarization loss is 1755.19 dB/cm, while the x-polarization loss is only 1.24 dB/cm. In the case of the same structure parameters as the proposed polarization filter, of which communication window is 1.55 µm, the designed structure also serves as a refractive index sensor from 1.330 to 1.365. The average sensitivity of the refractive index sensor is up to 4857 nm/RIU, and the highest sensitivity is 7588 nm/RIU when the refractive index is 1.365. The results show that the reported SPR-based PCF simultaneously implements dual communication window polarization filtering and refractive index sensing. Hence, the designed device has promising applications with good filtering and sensing performance.","PeriodicalId":13547,"journal":{"name":"Instrumentation Science & Technology","volume":"51 1","pages":"162 - 182"},"PeriodicalIF":1.6,"publicationDate":"2022-08-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"46410631","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 2
Zinc sulfide based thin film photodetector prepared by spray pyrolysis 喷雾热解法制备硫化锌基薄膜光电探测器
IF 1.6 4区 工程技术 Q4 CHEMISTRY, ANALYTICAL Pub Date : 2022-08-08 DOI: 10.1080/10739149.2022.2108832
Natheer A. Algadri, Ahmad M. Al-Diabat, N. M. Ahmed
Abstract The chemical spray pyrolysis technique was used to synthesis zinc sulfide (ZnS) thin films without annealing treatment. The thin films were grown on a glass substrate under various Zn:S ratios (1:1,1:2, 1:3). The spray solution was prepared by combining zinc acetate dihydrate and thiourea as precursor materials for Zn2+ and S2- ions, with deionized water serving as the solvent. The results of the ZnS film on glass showed a well-characterized thin film acquired using Zn:S of (1:1,1:2,1:3) molar ratio, nozzle to substrate distance (NSD) of 30 cm and a substrate temperature of 300 °C. Strong peaks (111) were obtained for all samples via X-ray diffraction analysis. The photoluminescence spectrum showed three distinctive peaks at roughly 2.36, 2.98, and 3.6 eV and the energy gap of the synthesized thin film was 3.66 eV. The MSM photodetectors (PDs) made from the layers on glass substrate showed response to UV illumination (400 nm), exhibiting a photosensitivity of 665% at base voltage of 3 V.
摘要采用化学喷雾热解技术,在未经退火处理的情况下合成了硫化锌(ZnS)薄膜。在不同的Zn:S比例(1∶1、2∶2、1∶3)下在玻璃衬底上生长薄膜。以去离子水为溶剂,将二水合乙酸锌和硫脲作为Zn2+和S2-离子的前驱体材料,制备了喷雾溶液。玻璃上的ZnS膜的结果显示,使用(1∶1,2,1∶3)摩尔比的Zn:S,喷嘴与衬底的距离(NSD)为30 cm和衬底温度为300 °C。通过X射线衍射分析获得了所有样品的强峰(111)。光致发光光谱在大约2.36、2.98和3.6处显示出三个不同的峰 eV,合成薄膜的能隙为3.66 由玻璃衬底上的层制成的MSM光电探测器(PD)显示出对UV照射的响应(400 nm),在3的基极电压下表现出665%的光敏性 五、
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引用次数: 4
Inexpensive spectrophotometric determination of nitrite with a laboratory-constructed flow cell 流动池光度法测定亚硝酸根的研究
IF 1.6 4区 工程技术 Q4 CHEMISTRY, ANALYTICAL Pub Date : 2022-08-08 DOI: 10.1080/10739149.2022.2108440
Mohsen Salimi, S. Nouroozi
Abstract Nitrite is a carcinogenic substance and its measurement in water samples is important to protect mankind. Here we have introduced a simple and inexpensive fluidic system for the online determination of nitrite in water samples. For this purpose, a highly sensitive, optical flow cell detector was fabricated and used in a fluidic system to prepare a compact unit for nitrite monitoring. Safranin solution in acidic media was used in the system for the sensitive and selective determination of nitrite. In acidic media, nitrite reacted with safranin to form a diazonium salt which caused the dye in the solution to change from reddish-orange to blue. The safranin solution absorbance, which is related to nitrite concentration, was monitored by the fabricated photometer with the flow detector at 525 nm. Water samples were processed to evaluate the effectiveness of both the introduced system and the analytical procedure. Good analytical performance was obtained, including a linear response from 0.3 up to 3 mg/l nitrite (r = 0.9918) with a detection limit of 0.1 mg/l and a relative standard deviation of 4.24% (n = 10), using the proposed setup.
摘要亚硝酸盐是一种致癌物质,其在水样中的检测对保护人类具有重要意义。在这里,我们介绍了一种简单廉价的流体系统,用于在线测定水样中的亚硝酸盐。为此,制造了一种高灵敏度的光学流动池检测器,并将其用于流体系统中,以制备用于亚硝酸盐监测的紧凑单元。采用酸性介质中的藏红溶液对亚硝酸根进行了灵敏、选择性的测定。在酸性介质中,亚硝酸盐与藏红反应形成重氮盐,使溶液中的染料从红橙色变为蓝色。藏红溶液的吸光度与亚硝酸盐浓度有关,通过制造的光度计和525的流量检测器进行监测 nm。对水样进行了处理,以评估引入的系统和分析程序的有效性。获得了良好的分析性能,包括0.3至3的线性响应 mg/l亚硝酸盐(r = 0.9918),检测限为0.1 mg/l,相对标准偏差为4.24%(n = 10) ,使用建议的设置。
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引用次数: 0
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