Dispensing nozzle for automatic analyzer, and automatic analyzer including same

An automatic analyzer comprising:

• a plurality of sample containers each containing a sample;
• a plurality of reagent containers each containing a reagent;
• a plurality of reaction Cells into which the samples and the reagents are to be injected;
• a sample dispensing mechanism comprising a sample dispensing nozzle and dispensing the samples in the sample containers into the reaction Cells;
• a reagent dispensing mechanism comprising a reagent dispensing nozzle and dispensing the reagents in the reagent containers into the reaction Cells, and
• electrostatic capacitance measuring means for measuring electrostatic capacitance between the sample dispensing nozzle and the reaction Cell, wherein
• the sample dispensing nozzle has a nozzle main body made of metal, and a silicon oxide layer on an outer surface of the nozzle main body, and a silicon derivative having polyethylene glycol, represented by the following general formula:
• Si—R1—(OCH2CH2)n—O—R2 (n is a positive integer of 2 or more, R1 is a hydrocarbon group, and R2 is H or CH3)
• is chemisorbed on the silicon oxide layer, and
• the electrostatic capacitance measuring means measures the electrostatic capacitance via the silicon oxide layer and the silicon derivative.