Automatic sampling, diluting and analysing module

The module has first and second sections 10, 20 containing eightway valves 11 and 21 which are operable to sample test liquid 30, add diluents 18 and 33 and reagent 34 prior to analysis 31. Typically the first section samples the test liquid using a pump 16 to supply a loop 13. Syringe 12 sucks up diluent 18 and then scavenges liquid from the loop for dilution and supply to a second loop 23. Another syringe 22 scavenges the now diluted sample from the second loop 23 and sucks up reagent 34 and diluent 33 and then delivers the resulting sample/reagent/diluent mixture to an analyser 31. Utility is in analysing hydrazine in solutions used in nuclear fuel reprocessing using dimethlyaminobenzaldehyde reagent.