TY - JOUR

T1 - p-Dimethylaminobenzaldehyde-based chemosensor for on-site sensing of ammonia precursor in concrete

AU - Тимофеева, Ирина Игоревна

AU - Давлетбаева, Полина Насимовна

AU - Москвин, Алексей Леонидович

AU - Булатов, Андрей Васильевич

PY - 2021/5/15

Y1 - 2021/5/15

N2 - A chemosensor for on-site sensing of ammonia precursor in concrete to avoid a problem of ammonia emission into the indoor space of concrete buildings was designed and implemented. It was found that aqueous extracts of concrete samples containing antifreeze additives and excreting ammonia were colored in the presence of p-dimethylaminobenzaldehyde. This phenomenon was used for the fast visual sensing of main ammonia precursor (urea) in concrete for the first time. The developed sensor consisted of a sensing solid phase based on an adsorbent modified with p-dimethylaminobenzaldehyde. Various adsorbents were investigated for the immobilization of the reagent and it was established that silica adsorbent Silochrom C-120 provided effective retention of the reagent and Schiff's base formation during the sampling. Moreover, Silochrom C-120 modified with ascorbic acid was proposed to eliminate the oxidant interference. The sensor displayed excellent selectivity and sensitivity with the visual detection limit of 15 mg kg −1 in terms of urea. The chemosensor was successfully applied by builders on different construction sites. Sample preparation and sensing times were about 2 min and 1 min, respectively.

AB - A chemosensor for on-site sensing of ammonia precursor in concrete to avoid a problem of ammonia emission into the indoor space of concrete buildings was designed and implemented. It was found that aqueous extracts of concrete samples containing antifreeze additives and excreting ammonia were colored in the presence of p-dimethylaminobenzaldehyde. This phenomenon was used for the fast visual sensing of main ammonia precursor (urea) in concrete for the first time. The developed sensor consisted of a sensing solid phase based on an adsorbent modified with p-dimethylaminobenzaldehyde. Various adsorbents were investigated for the immobilization of the reagent and it was established that silica adsorbent Silochrom C-120 provided effective retention of the reagent and Schiff's base formation during the sampling. Moreover, Silochrom C-120 modified with ascorbic acid was proposed to eliminate the oxidant interference. The sensor displayed excellent selectivity and sensitivity with the visual detection limit of 15 mg kg −1 in terms of urea. The chemosensor was successfully applied by builders on different construction sites. Sample preparation and sensing times were about 2 min and 1 min, respectively.

KW - Ammonia emission

KW - Antifreeze additives

KW - Chemosensor

KW - Concrete

KW - Screening

KW - Urea

KW - BIOSENSOR

KW - UREA DETERMINATION

KW - BLOOD

UR - http://www.scopus.com/inward/record.url?scp=85100891574&partnerID=8YFLogxK

UR - https://www.mendeley.com/catalogue/56b4d17d-be83-3892-9db5-19e9ab2e63bc/

U2 - 10.1016/j.saa.2021.119556

DO - 10.1016/j.saa.2021.119556

M3 - Article

VL - 253

JO - SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY

JF - SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY

SN - 1386-1425

IS - 119556

M1 - 119556

ER -