Objective To establish a simple, sensitive and accurate analytical method to determine 15 elements in drinking water-related products soak test. Methods Inductively coupled plasma-mass spectrometry (ICP-MS) was employed to determine 15 elements in the soaking liquid. Sc, Ge, In and Bi were used as the internal standard substances. Results The test results showed the linear correlation coefficients for all elements were more than 0.999, the recovery rate were 80.6%-120.0% and precision was fine, RSD was lower than 6.0 %, the test results also showed a close agreement with the reference values in test of reference materials of GSBZ 50009-88, GSBZ 500019-90, GSBZ 50004-88 and GSBZ50039-95. Conclusion This method is simple, rapid, sensitive, accurate and suitable for determination of 15 elements in drinking water-related products soak test.

Objective To explore the effect of exposure to noise of 3.0T magnetic resonance imaging(MRI)on children's cochlear function.Methods We prospectively recruited 72 children who underwent cranial MRI examination at our hospital from May to November 2018;3M earplugs and sponge mats were used for hearing protection during MRI scanning.Noise level(dBA)of each MRI sequence was detected with a nonmagnetic microphone and a sound level meter.Distortion product otoacoustic emissions(DPOAE)test at 2-7 kHz was performed 24 hours before and 30 minutes after the MRI examination.Paired t-test or Wilcoxon signed-rank test was used to analyze differences in DPOAE amplitude before and after the MRI examination.Results The average noise level of MRI measured in the study was(107.7±3.92)dBA.Compared with that before the MRI examination,the DPOAE amplitude(dB)changed little after the MRI examination;the range of amplitude differences in each age group was as follows:left ear(-0.24-1.10)and right ear(-0.24-0.74)in the 0-1 year-old group;left ear(-0.07-0.59)and right ear(-0.57-0.75)in the 2-5 year-old group;left ear(-0.36-0.44)and right ear(-0.30-0.57)in the 6-12 year-old group.No statistically significant difference was found(correction P＞0.05).Conclusion No potential impact of 3.0T MRI noise on children's cochlear function was observed under routine hearing protection.