Abstract: Synthetic cassiterite used as a standard substance for in-situ tin isotope testing, a preparation thereof, and a method for in-situ tin isotope analysis using the synthetic cassiterite are provided. The preparing method includes: grinding a natural cassiterite into ultrafine powder; and obtaining a synthetic cassiterite that can be used as a standard substance.

Abstract: The present invention discloses a sample loading apparatus for laser ablation, including a target seat, a base, an air channel, an aerosol channel and a sample chamber, wherein a shrinking mouth is formed in the top of the sample chamber and positioned on a lower surface of the aerosol channel; a spring is arranged in the sample chamber; an opening is formed in a lower surface of the sample chamber and communicated with an air outlet; a stop valve is arranged at the air outlet; one end of the aerosol channel is communicated with a carrier gas inlet, and the other end is communicated with an aerosol outlet; and a top of the aerosol channel includes a first transparent material. The present invention increases stable reliability in a continuous use process, and improves consistency of aerosol transmission efficiency, so that different samples are analyzed.