Highly sensitive colorimetric detection of lead using XXXX functionalized gold nanoparticles.

@entity10694 @entity8862 @entity596 @entity8326 @entity1025 @entity8863 @entity1423 @entity3280 @entity3281 @entity597 @entity15912 @entity515 @entity3411 @entity141 @entity13303 @entity1473 @entity10781
Highly sensitive colorimetric detection for @entity10781 has been developed using @entity15912 (MA) functionalized GNP. The - @entity1473 on MA was used to modify GNP surface whereas the other - @entity1473 functional group have strong affinity to coordination behavior of @entity10781 allowing the selective formation more than other ions. MA-GNPs solution changed from red to blue color after the addition of @entity10781 due to @entity1423 . The different optical absorption and discriminate of particle size between the MA-GNPs solution with and without @entity10781 were characterized by UV-visible spectroscopy and transmission electron microscopy (TEM), respectively. The color intensity as a function of @entity10781 concentration gave a linear response in the range of 0.0-10.0  gL(-1) (R(2)=0.990). The detection limit was found at 0.5  gL(-1) by naked eye and can be completed the analysis within 15min. The MA-GNPs aggregated with @entity10781 showed high selectivity when was compared to other metal ions ( @entity13303 , @entity141 , @entity3280 , @entity515 , @entity8863 , @entity596 , @entity10694 , @entity1025 , @entity3281 , @entity3411 , @entity10781 and @entity8862 ) and anions (Cl(-), @entity8326 and @entity597 ). Our proposed method was also applied for the determination of @entity10781 in real drinking water samples from 5 sources. The result of real water samples were not statistically significant different from the standard methods at the 95% confidence level (pair t-test method). Moreover, we evaluated our proposed method for the determination of trace @entity10781 concentration in real breast milk samples. The recoveries were acceptable and ranged from 101 to 104% for spiked @entity10781 in real breast milk samples. Thus, MA-GNP colorimetric sensing provides a simple, rapid, sensitive, easy-to-use, inexpensive and low detection limit for the monitoring of @entity10781 .
