Electromagnetic Interference Measurement Antennas; Standard Calibration Method

A sensitive strategy to rapidly detect fipronil residues in eggs using multibranch gold nanoparticles (AuNPs) as the substrate of surface-enhanced Raman spectroscopy (SERS) was investigated in this study. Under optimized conditions, fipronil molecules preferentially deposited on the multibranch gold nanoparticles with preferential (111) facet-oriented growth due to its low surface energy. This anisotropic growth promoted the increase of SERS “hot spots”, inducing a huge enhancement of Raman signals of the fipronil. An external standard calibration method was employed for quantitative analysis, and the method was validated for linearity, sensitivity, repeatability and recovery. Good linearity were found in the concentration range of 10 ng/L~10 mg/L in fipronil acetone solution (R2 = 0.9916) and 8 × 10−5 mg/m2 to 0.8 mg/m2 on eggshells (R2 = 0.9906), respectively. The recovery rate based on acetone recovered fipronil on eggshells and in egg liquids was 80.13%~87.87%, and 81.34%~88.89%, respectively. The SERS assay was successfully used to monitor fipronil in eggs.

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External Standard Calibration Method To Measure the Hydroxyl Radical Scavenging Capacity of Water Samples

Environmental Science & Technology ◽

10.1021/acs.est.9b06273 ◽

2019 ◽

Vol 54 (3) ◽

pp. 1929-1937 ◽

Cited By ~ 3

Author(s):

Chengjin Wang ◽

Erik Rosenfeldt ◽

Yi Li ◽

Ron Hofmann

Keyword(s):

Hydroxyl Radical ◽

Water Samples ◽

Radical Scavenging ◽

Calibration Method ◽

Radical Scavenging Capacity ◽

Scavenging Capacity ◽

External Standard ◽

Standard Calibration

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Determination of Trace and Heavy Metals in Fruit Juices in the Romanian Market

Bulletin of University of Agricultural Sciences and Veterinary Medicine Cluj-Napoca Horticulture ◽

10.15835/buasvmcn-hort:2020.0022 ◽

2020 ◽

Vol 77 (2) ◽

pp. 125

Author(s):

Florin Dumitru BORA ◽

Anamaria CĂLUGĂR ◽

Claudiu Ioan BUNEA ◽

Ionut RACZ

Keyword(s):

Heavy Metals ◽

Calibration Method ◽

Fruit Juices ◽

Trace Heavy Metals ◽

Icp Ms ◽

Metal Contents ◽

External Standard ◽

Standard Calibration ◽

Peach Juice

The presence of trace, heavy metals in foodstuffs is of intense public interest. The aim of this study was to determine the metal contents in most known commercial fruit juices present on the Romanian market. The multielement analysis was made using the ICP-MS technique, after appropriate dilution, using the external standard calibration method. Multifruit, mango, and kiwi juice have recoded the highest concentration of Cu, while apple and pear juice has recoded the lowest concentration, and in the case of Zn, peach juice has recoded the highest concentration. Concerning Pb, Cd, and As concentration, apple, peach, and multifruit juices recorded the highest levels of concentration. The concentration of Zn, Cu, Co, and As generally, was higher in the juice samples packed in boxes, while Ni, Cr, Pb, and Cd recorded the highest values in the juice packed in plastic bottles.

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