Sulfide tests

Sulfur compounds No reaction at sodium plumbite test (NF M 41-006) Pass hydrogen sulfide test (ISO 8819, future NF EN 28819)... 

If the pH level of drilling fluid drops and the hydrogen sulfide test result is negative, there is a good possibility that carbon dioxide will be present. Positive results of microbial activity tests (described later) also indicate the possibility of carbon dioxide presence. Carbon dioxide meters are also available commercially and can be used. 

The by-product, representing a relatively reduced form of sulfur, is a reasonable model for the sulfur impurities in the synthesis gas obtained from sulfur-rich coal. This sodium sulfide test of sulfur resistance of water gas shift catalyst systems generated in basic solutions is a very severe test since the quantities of sulfur involved are much larger than those likely to be found in synthesis gas made from any sulfur-rich coals. 

Accdg to A.R. Lusardi of picArsn, LSt does not form any ppt with Nessler s Reagent. The presence of lead can be verified by hydrogen sulfide test, potassium dichromate test or dithizone test Basic Lead Styphnate (Baste LSt)... 

To compare the corrosion behavior of coated and uncoated samples, several oxidation/ sulfidation tests were performed at 700 to 1000°C in a thermogravimetric microbalance. Test results for oxidation of various samples in flowing air and sulfidation in 498-ppm H S/H gas mixture for one month are shown in Figure 8. 

Sulfidation tests of the different alloys were carried out over the temperature range 750-950°C. Plots of the square of mass gain vs. time in different H2-H2S atmospheres at 900°C are shown in Fig. la,b,c.The kinetics of Ni36Al and Ni45Al follow the parabolic rate law with rather high corrosion rates. In gas mixtures containing less than 0.5 vol.% H2S no sulfidation but alumina growth was observed. 

Another oxidation/sulfidation test to assess the performance of gas turbine alloys is the burner rig test A schematic of the burner rig is shown in Fig. 6. Here a jet fuel is burned in a combustion chamber with an air-fuel ratio of 30 1. The flame jrasses down a tube at the end of which are the samples to be evaluated, mounted in a rotating platen. The samples are in the form of pins. The jet fuel normally contains a certain amount of sulfur. There are provisions to add additional sulfur in the form of volatile sulfur compounds. In addition, seawater can be added into the gas stream to simulate a marine environment. The setmples are typicaDy exposed to the flame temperature for 58 min and cooling air for 2 min in a 1-h cycle. The test is typiccJly conducted for about 500 h. 

NACE sulfide test [7,8] compositions at high temperature... 

Hydrogen sulfide. Test with iodine-azide solution, see page 437, or, for the detection of traces, see page 590. 

A system using maleic acid was invented by Lawson to suppress hydrogen sulfide during the removal of iron sulfide. Tests showed that >90% suppression of H2S could be achieved while 65% of the FeS was dissolved. 

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