A new method for determination of Nickel using 2-(8 -hydroxy quinolino-5-sulfoacid-7-azo)-1,8-dihydroxy-3,6-naphthalene disulfoacid is set u p. In pH9.37 B-R media ,Nickel and 8Q5SAC react to form a 1∶3 complex, and ...A new method for determination of Nickel using 2-(8 -hydroxy quinolino-5-sulfoacid-7-azo)-1,8-dihydroxy-3,6-naphthalene disulfoacid is set u p. In pH9.37 B-R media ,Nickel and 8Q5SAC react to form a 1∶3 complex, and surface active agen t CTMAB has effect of increasing sensitivity. The maximum absorbance of the reagent is 692 nm, th e complex is 542 nm, and the apparent molar absorptivity is 6 0×10 4L·mol -1 ·cm -1 , by using dual wavelength increasing sensitivity method. Beer’s law is obeyed by in 0～20 μg/25 mL for Nickel. The sensitivity increased by 2 5 times in contrast with using single w alvelength. The method is applied to the determination of Nickel in actual sampl es with satisfactory results.展开更多
The effects of different x values on the dielectric properties in the Ba6-3xSm8+2xTi18O54 microwave dielectric ceramics(0.3≤x≤0.7) were studied. The results showed that the major crystal phase was BaSm2Ti4O12 and th...The effects of different x values on the dielectric properties in the Ba6-3xSm8+2xTi18O54 microwave dielectric ceramics(0.3≤x≤0.7) were studied. The results showed that the major crystal phase was BaSm2Ti4O12 and the sintering temperature of the ceramics was 1340 ℃ when the x value was 0.67. The dielectric properties were better: εr≈79, tanδ≈1×10-4(1 MHz); εr≈80, Q·f=9230 GHz(3.97 GHz), τf=-17 ppm·℃-1.展开更多
文摘A new method for determination of Nickel using 2-(8 -hydroxy quinolino-5-sulfoacid-7-azo)-1,8-dihydroxy-3,6-naphthalene disulfoacid is set u p. In pH9.37 B-R media ,Nickel and 8Q5SAC react to form a 1∶3 complex, and surface active agen t CTMAB has effect of increasing sensitivity. The maximum absorbance of the reagent is 692 nm, th e complex is 542 nm, and the apparent molar absorptivity is 6 0×10 4L·mol -1 ·cm -1 , by using dual wavelength increasing sensitivity method. Beer’s law is obeyed by in 0～20 μg/25 mL for Nickel. The sensitivity increased by 2 5 times in contrast with using single w alvelength. The method is applied to the determination of Nickel in actual sampl es with satisfactory results.
文摘The effects of different x values on the dielectric properties in the Ba6-3xSm8+2xTi18O54 microwave dielectric ceramics(0.3≤x≤0.7) were studied. The results showed that the major crystal phase was BaSm2Ti4O12 and the sintering temperature of the ceramics was 1340 ℃ when the x value was 0.67. The dielectric properties were better: εr≈79, tanδ≈1×10-4(1 MHz); εr≈80, Q·f=9230 GHz(3.97 GHz), τf=-17 ppm·℃-1.
文摘目的明确1例腮-耳-肾综合征孕妇及其家族成员的遗传学病因,并对其胎儿进行产前诊断.方法采用外周血染色体核型分析及染色体微阵列分析(chromosomal microarray analysis,CMA)技术对表型异常的孕妇进行遗传学检查,了解其拷贝数变异(copy number variants,CNVs)的情况.同时行其家族成员的相关检测,明确其遗传学特征,在此基础上实施产前诊断.结果该孕妇及其女儿均携带染色体8q13.3微缺失,带有EYA1致病基因,同为腮-耳-肾综合征患者,胎儿亦携带有该CNVs,其他家系成员未发现表型及基因型的异常.结论位于染色体8q13.3区的EYA1基因突变是该家系鳃-耳-肾综合征的分子基础,符合常染色体显性遗传的规律.
