Spectrophotometic Determination of Trace Zinc in Milk Powder by Ethyl Rhodamine B

Dong, Wei; Xu, Gang

doi:10.14233/ajchem.2014.18126

Cited by 1 publication

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References 1 publication

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“…To detect thiocyanate in milk, various methods have been reported including spectrophotometric, high-performance liquid chromatography (HPLC), etc. [11,12,13,14,15,16]. Although these methods have the advantages of high accuracy and sensitivity, they require expensive instruments and professional technicians, and they are subjected to complicated pretreatment long time consumption.…”

Section: Introductionmentioning

confidence: 99%

Surface Enhanced Raman Spectroscopy Detection of Sodium Thiocyanate in Milk Based on the Aggregation of Ag Nanoparticles

Feng

Zhou

et al. 2019

Sensors

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A method is developed for detecting the concentration of sodium thiocyanate (NaSCN) in milk based on surface-enhanced Raman scattering (SERS) technology. A trichloroacetic acid solution can be used to enhance the SERS signal because of its function in promoting the aggregation of Ag nanoparticles (Ag NPs). Meanwhile, the protein in milk would be precipitated as trichloroacetic acid added and the interference from protein could be reduced during the detection. In this work, the enhancement factor (EF) is 7. 56 × 105 for sodium thiocyanate in water and the limit of detection (LOD) is 0.002 mg/L. Meanwhile, this method can be used to detect the concentration of sodium thiocyanate in milk. Results show that SERS intensity increased as the concentration of sodium thiocyanate increase from 10 to 100 mg/L. The linear correlation coefficient is R2 = 0.998 and the detection limit is 0.04 mg/L. It is observed that the concentration of sodium thiocyanate does not exceed the standard in the three kinds of milk. The confirmed credibility of SERS detection is compared with conventional methods.

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